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Posted to commits@trafficcontrol.apache.org by ne...@apache.org on 2017/01/14 22:05:10 UTC
[20/75] [partial] incubator-trafficcontrol-website git commit: add
1.8.0 docs
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+ <div role="main" class="document">
+
+ <div class="section" id="caching-proxies">
+<span id="rl-caching-proxy"></span><h1>Caching Proxies<a class="headerlink" href="#caching-proxies" title="Permalink to this headline">�</a></h1>
+<p>The main function of a CDN is to proxy requests from clients to origin servers
+and cache the results.
+To proxy, in the CDN context, is to obtain content using HTTP from an origin
+server on behalf of a client. To cache is to store the results so they can be
+reused when other clients are requesting the same content. There are three
+types of proxies in use on the Internet today which are described below.</p>
+<div class="section" id="arrow-reverse-proxy">
+<span id="rl-rev-proxy"></span><span id="index-0"></span><h2><img alt="arrow" src="../_images/fwda.png" /> Reverse Proxy<a class="headerlink" href="#arrow-reverse-proxy" title="Permalink to this headline">�</a></h2>
+<blockquote>
+<div>A reverse proxy acts on behalf of the origin server. The client is mostly unaware it is communicating with a proxy and not the actual origin.
+All EDGE caches in a Traffic Control CDN are reverse proxies.
+To the end user a Traffic Control based CDN appears as a reverse proxy since
+it retrieves content from the origin server, acting on behalf of that origin server. The client requests a URL that has
+a hostname which resolves to the reverse proxy’s IP address and, in compliance
+with the HTTP 1.1 specification, the client sends a <code class="docutils literal"><span class="pre">Host:</span></code> header to the reverse
+proxy that matches the hostname in the URL.
+The proxy looks up this hostname in a
+list of mappings to find the origin hostname; if the hostname of the Host header is not found in the list,
+the proxy will send an error (<code class="docutils literal"><span class="pre">404</span> <span class="pre">Not</span> <span class="pre">Found</span></code>) to the client.
+If the supplied hostname is found in this list of mappings, the proxy checks the cache, and when the content is not already present, connects to the
+origin the requested <code class="docutils literal"><span class="pre">Host:</span></code> maps to and requests the path of the original URL, providing the origin hostname in the <code class="docutils literal"><span class="pre">Host</span></code> header. The proxy then stores the URL in cache and serves the contents to the client. When there are subsequent requests for
+the same URL, a caching proxy serves the content out of cache thereby reducing
+latency and network traffic.</div></blockquote>
+<div class="admonition seealso">
+<p class="first admonition-title">See also</p>
+<p class="last"><a class="reference external" href="https://docs.trafficserver.apache.org/en/latest/admin/reverse-proxy-http-redirects.en.html#http-reverse-proxy">ATS documentation on reverse proxy</a>.</p>
+</div>
+<p>To insert a reverse proxy into the previous HTTP 1.1 example, the reverse proxy requires provisioning
+for <code class="docutils literal"><span class="pre">www.origin.com</span></code>. By adding a remap rule to the cache, the reverse proxy then maps requests to
+this origin. The content owner must inform the clients, by updating the URL, to receive the content
+from the cache and not from the origin server directly. For this example, the remap rule on the
+cache is: <code class="docutils literal"><span class="pre">http://www-origin-cache.cdn.com</span> <span class="pre">http://www.origin.com</span></code>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">In the previous example minimal headers were shown on both the request and response. In the examples that follow, the origin server response is more realistic.</p>
+</div>
+<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK
+Date: Sun, 14 Dec 2014 23:22:44 GMT
+Server: Apache/2.2.15 (Red Hat)
+Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT
+ETag: "1aa008f-2d-50a3559482cc0"
+Content-Length: 45
+Connection: close
+Content-Type: text/html; charset=UTF-8
+
+<html><body>This is a fun file</body></html>
+</pre></div>
+</div>
+<p>The client is given the URL <code class="docutils literal"><span class="pre">http://www-origin-cache.cdn.com/foo/bar/fun.html</span></code> (note the different hostname) and when attempting to obtain that URL, the following occurs:</p>
+<ol class="arabic">
+<li><p class="first">The client sends a request to the LDNS server to resolve the name <code class="docutils literal"><span class="pre">www-origin-cache.cdn.com</span></code> to an IPv4 address.</p>
+</li>
+<li><p class="first">Similar to the previous case, the LDNS server resolves the name <code class="docutils literal"><span class="pre">www-origin-cache.cdn.com</span></code> to an IPv4 address, in this example, this address is 55.44.33.22.</p>
+</li>
+<li><p class="first">The client opens a TCP connection from a random port locally, to port 80 (the HTTP default) on 55.44.33.22, and sends the following:</p>
+<div class="highlight-python"><div class="highlight"><pre>GET /foo/bar/fun.html HTTP/1.1
+Host: www-origin-cache.cdn.com
+</pre></div>
+</div>
+</li>
+<li><p class="first">The reverse proxy looks up <code class="docutils literal"><span class="pre">www-origin-cache.cdn.com</span></code> in its remap rules, and finds the origin is <code class="docutils literal"><span class="pre">www.origin.com</span></code>.</p>
+</li>
+<li><p class="first">The proxy checks its cache to see if the response for <code class="docutils literal"><span class="pre">http://www-origin-cache.cdn.com/foo/bar/fun.html</span></code> is already in the cache.</p>
+</li>
+</ol>
+<p>6a. If the response is not in the cache:</p>
+<blockquote>
+<div><ol class="arabic">
+<li><p class="first">The proxy uses DNS to get the IPv4 address for <code class="docutils literal"><span class="pre">www.origin.com</span></code>, connect to it on port 80, and sends:</p>
+<div class="highlight-python"><div class="highlight"><pre>GET /foo/bar/fun.html HTTP/1.1
+Host: www.origin.com
+</pre></div>
+</div>
+</li>
+<li><p class="first">The origin server responds with the headers and content as shown:</p>
+<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK
+Date: Sun, 14 Dec 2014 23:22:44 GMT
+Server: Apache/2.2.15 (Red Hat)
+Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT
+ETag: "1aa008f-2d-50a3559482cc0"
+Content-Length: 45
+Connection: close
+Content-Type: text/html; charset=UTF-8
+
+<html><body>This is a fun file</body></html>
+</pre></div>
+</div>
+</li>
+<li><p class="first">The proxy sends the origin response on to the client adding a <code class="docutils literal"><span class="pre">Via:</span></code> header (and maybe others):</p>
+<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK
+Date: Sun, 14 Dec 2014 23:22:44 GMT
+Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT
+ETag: "1aa008f-2d-50a3559482cc0"
+Content-Length: 45
+Connection: close
+Content-Type: text/html; charset=UTF-8
+Age: 0
+Via: http/1.1 cache01.cdn.kabletown.net (ApacheTrafficServer/4.2.1 [uScSsSfUpSeN:t cCSi p sS])
+Server: ATS/4.2.1
+
+ <html><body>This is a fun file</body></html>
+</pre></div>
+</div>
+</li>
+</ol>
+</div></blockquote>
+<p>6b. If it <em>is</em> in the cache:</p>
+<blockquote>
+<div><p>The proxy responds to the client with the previously retrieved result:</p>
+<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK
+Date: Sun, 14 Dec 2014 23:22:44 GMT
+Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT
+ETag: "1aa008f-2d-50a3559482cc0"
+Content-Length: 45
+Connection: close
+Content-Type: text/html; charset=UTF-8
+Age: 39711
+Via: http/1.1 cache01.cdn.kabletown.net (ApacheTrafficServer/4.2.1 [uScSsSfUpSeN:t cCSi p sS])
+Server: ATS/4.2.1
+
+<html><body>This is a fun file</body></html>
+</pre></div>
+</div>
+</div></blockquote>
+</div>
+<div class="section" id="arrow-forward-proxy">
+<span id="rl-fwd-proxy"></span><span id="index-1"></span><h2><img alt="arrow" src="../_images/fwda.png" /> Forward Proxy<a class="headerlink" href="#arrow-forward-proxy" title="Permalink to this headline">�</a></h2>
+<blockquote>
+<div>A forward proxy acts on behalf of the client. The origin server is mostly
+unaware of the proxy, the client requests the proxy to retrieve content from a
+particular origin server. All MID caches in a Traffic Control based CDN are
+forward proxies. In a forward proxy scenario, the client is explicitely configured to use the
+the proxy’s IP address and port as a forward proxy. The client always connects to the forward
+proxy for content. The content provider does not have to change the URL the
+client obtains, and is unaware of the proxy in the middle.</div></blockquote>
+<div class="admonition seealso">
+<p class="first admonition-title">See also</p>
+<p class="last"><a class="reference external" href="https://docs.trafficserver.apache.org/en/latest/admin/forward-proxy.en.html">ATS documentation on forward proxy</a>.</p>
+</div>
+<p>Below is an example of the client retrieving the URL <code class="docutils literal"><span class="pre">http://www.origin.com/foo/bar/fun.html</span></code> through a forward proxy:</p>
+<ol class="arabic simple">
+<li>The client requires configuration to use the proxy, as opposed to the reverse proxy example. Assume the client configuration is through preferences entries or other to use the proxy IP address 99.88.77.66 and proxy port 8080.</li>
+<li>To retrieve <code class="docutils literal"><span class="pre">http://www.origin.com/foo/bar/fun.html</span></code> URL, the client connects to 99.88.77.66 on port 8080 and sends:</li>
+</ol>
+<blockquote>
+<div><div class="highlight-python"><div class="highlight"><pre>GET http://www.origin.com/foo/bar/fun.html HTTP/1.1
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">In this case, the client places the entire URL after GET, including protocol and hostname (<code class="docutils literal"><span class="pre">http://www.origin.com</span></code>), but in the reverse proxy and direct-to-origin case it puts only the path portion of the URL (<code class="docutils literal"><span class="pre">/foo/bar/fun.html</span></code>) after the GET.</p>
+</div>
+</div></blockquote>
+<ol class="arabic simple" start="3">
+<li>The proxy verifies whether the response for <code class="docutils literal"><span class="pre">http://www-origin-cache.cdn.com/foo/bar/fun.html</span></code> is already in the cache.</li>
+</ol>
+<p>4a. If it is not in the cache:</p>
+<blockquote>
+<div><ol class="arabic">
+<li><p class="first">The proxy uses DNS to obtain the IPv4 address for <code class="docutils literal"><span class="pre">www.origin.com</span></code>, connects to it on port 80, and sends:</p>
+<div class="highlight-python"><div class="highlight"><pre>GET /foo/bar/fun.html HTTP/1.1
+Host: www.origin.com
+</pre></div>
+</div>
+</li>
+<li><p class="first">The origin server responds with the headers and content as shown below:</p>
+<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK
+Date: Sun, 14 Dec 2014 23:22:44 GMT
+Server: Apache/2.2.15 (Red Hat)
+Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT
+ETag: "1aa008f-2d-50a3559482cc0"
+Content-Length: 45
+Connection: close
+Content-Type: text/html; charset=UTF-8
+
+<html><body>This is a fun file</body></html>
+</pre></div>
+</div>
+</li>
+<li><p class="first">The proxy sends this on to the client adding a <code class="docutils literal"><span class="pre">Via:</span></code> header (and maybe others):</p>
+<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK
+Date: Sun, 14 Dec 2014 23:22:44 GMT
+Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT
+ETag: "1aa008f-2d-50a3559482cc0"
+Content-Length: 45
+Connection: close
+Content-Type: text/html; charset=UTF-8
+Age: 0
+Via: http/1.1 cache01.cdn.kabletown.net (ApacheTrafficServer/4.2.1 [uScSsSfUpSeN:t cCSi p sS])
+Server: ATS/4.2.1
+
+<html><body>This is a fun file</body></html>
+</pre></div>
+</div>
+</li>
+</ol>
+</div></blockquote>
+<p>4b. If it <em>is</em> in the cache:</p>
+<blockquote>
+<div><p>The proxy responds to the client with the previously retrieved result:</p>
+<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK
+Date: Sun, 14 Dec 2014 23:22:44 GMT
+Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT
+ETag: "1aa008f-2d-50a3559482cc0"
+Content-Length: 45
+Connection: close
+Content-Type: text/html; charset=UTF-8
+Age: 99711
+Via: http/1.1 cache01.cdn.kabletown.net (ApacheTrafficServer/4.2.1 [uScSsSfUpSeN:t cCSi p sS])
+Server: ATS/4.2.1
+
+<html><body>This is a fun file</body></html>
+</pre></div>
+</div>
+</div></blockquote>
+</div>
+<div class="section" id="arrow-transparent-proxy">
+<span id="index-2"></span><h2><img alt="arrow" src="../_images/fwda.png" /> Transparent Proxy<a class="headerlink" href="#arrow-transparent-proxy" title="Permalink to this headline">�</a></h2>
+<blockquote>
+<div>Neither the origin nor the client are aware of the actions performed by the transparent proxies. A Traffic Control based CDN does not use transparent proxies. If you are interested you can learn more about transparent proxies on <a class="reference external" href="http://en.wikipedia.org/wiki/Proxy_server#Transparent_proxy">wikipedia</a>.</div></blockquote>
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+<li class="toctree-l2"><a class="reference internal" href="caching_proxies.html">Caching Proxies</a></li>
+<li class="toctree-l2"><a class="reference internal" href="cache_revalidation.html">Cache Control Headers and Revalidation</a></li>
+</ul>
+</li>
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+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">Traffic Control Overview</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../overview/introduction.html">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_ops.html">Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_portal.html">Traffic Portal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_router.html">Traffic Router</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_monitor.html">Traffic Monitor</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_stats.html">Traffic Stats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_server.html">Traffic Server</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_vault.html">Traffic Vault</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">Administrator’s Guide</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_install.html">Installing Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_config.html">Configuring Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_using.html">Using Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_extensions.html">Managing Traffic Ops Extensions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_portal.html">Traffic Portal Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_monitor.html">Traffic Monitor Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_router.html">Traffic Router Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_stats.html">Traffic Stats Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_server.html">Traffic Server Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_vault.html">Traffic Vault Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/quick_howto/index.html">Quick How To Guides</a></li>
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+<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Developer’s Guide</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_ops.html">Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_portal.html">Traffic Portal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_router.html">Traffic Router</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_monitor.html">Traffic Monitor</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_stats.html">Traffic Stats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_server.html">Traffic Server</a></li>
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+ <div class="section" id="content-delivery-networks">
+<span id="index-0"></span><h1>Content Delivery Networks<a class="headerlink" href="#content-delivery-networks" title="Permalink to this headline">�</a></h1>
+<p>The vast majority of today’s Internet traffic is media files (often video or audio) being sent from a single source (the <em>Content Provider</em>) to many thousands or even millions of destinations (the <em>Content Consumers</em>). Content Delivery Networks are the technology that make that one-to-many distribution possible in an economical way. A Content Delivery Network (CDN) is a distributed system of servers for delivering content over HTTP. These servers are deployed in multiple locations with the goal of optimizing the delivery of content to the end users, while minimizing the traffic on the network. A CDN typically consists of the following:</p>
+<ul>
+<li><dl class="first docutils">
+<dt><strong>Caching Proxies</strong></dt>
+<dd><p class="first last">The proxy (cache or caching proxy) is a server that both proxies the requests and caches the results for reusing.</p>
+</dd>
+</dl>
+</li>
+<li><dl class="first docutils">
+<dt><strong>Content Router</strong></dt>
+<dd><p class="first last">The Content Router ensures that the end user is connected to the optimal cache for the location of the end user and content availability.</p>
+</dd>
+</dl>
+</li>
+<li><dl class="first docutils">
+<dt><strong>Health Protocol</strong></dt>
+<dd><p class="first last">The Health Protocol monitors the usage of the caches and tenants in the CDN.</p>
+</dd>
+</dl>
+</li>
+<li><dl class="first docutils">
+<dt><strong>Configuration Management System</strong></dt>
+<dd><p class="first last">In many cases a CDN encompasses hundreds of servers across a large geographic area. The Configuration Management System allows an operator to manage these servers.</p>
+</dd>
+</dl>
+</li>
+<li><dl class="first docutils">
+<dt><strong>Log File Analysis System</strong></dt>
+<dd><p class="first last">Every transaction in the CDN gets logged. The Log File Analysis System aggregates all of the log entries from all of the servers to a central location for analysis and troubleshooting.</p>
+</dd>
+</dl>
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+<li class="toctree-l2"><a class="reference internal" href="caching_proxies.html">Caching Proxies</a></li>
+<li class="toctree-l2"><a class="reference internal" href="cache_revalidation.html">Cache Control Headers and Revalidation</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">Traffic Control Overview</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../overview/introduction.html">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_ops.html">Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_portal.html">Traffic Portal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_router.html">Traffic Router</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_monitor.html">Traffic Monitor</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_stats.html">Traffic Stats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_server.html">Traffic Server</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_vault.html">Traffic Vault</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">Administrator’s Guide</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_install.html">Installing Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_config.html">Configuring Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_using.html">Using Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_extensions.html">Managing Traffic Ops Extensions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_portal.html">Traffic Portal Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_monitor.html">Traffic Monitor Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_router.html">Traffic Router Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_stats.html">Traffic Stats Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_server.html">Traffic Server Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_vault.html">Traffic Vault Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/quick_howto/index.html">Quick How To Guides</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Developer’s Guide</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_ops.html">Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_portal.html">Traffic Portal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_router.html">Traffic Router</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_monitor.html">Traffic Monitor</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_stats.html">Traffic Stats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_server.html">Traffic Server</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../faq/development.html">Development</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../faq/administration.html">Running a Traffic Control CDN</a></li>
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+
+ <div class="section" id="http-1-1">
+<span id="index-0"></span><h1>HTTP 1.1<a class="headerlink" href="#http-1-1" title="Permalink to this headline">�</a></h1>
+<p>For a comprehensive look at Traffic Control, it is important to understand basic HTTP 1.1 protocol operations and how caches function. The example below illustrates the fulfillment of an HTTP 1.1 request in a situation without CDN or proxy, followed by viewing the changes after inserting different types of (caching) proxies. Several of the examples below are simplified for clarification of the essentials.</p>
+<p>For complete details on HTTP 1.1 see <a class="reference external" href="https://www.ietf.org/rfc/rfc2616.txt">RFC 2616 - Hypertext Transfer Protocol – HTTP/1.1</a>.</p>
+<p>Below are the steps of a client retrieving the URL <code class="docutils literal"><span class="pre">http://www.origin.com/foo/bar/fun.html</span></code> using HTTP/1.1 without proxies:</p>
+<ol class="arabic simple">
+<li>The client sends a request to the Local DNS (LDNS) server to resolve the name <code class="docutils literal"><span class="pre">www.origin.com</span></code> to an IPv4 address.</li>
+<li>If the LDNS does not have this name (IPv4 mapping cached), it sends DNS requests to the ., .com, and .origin.com authoritative servers until it receives a response with the address for <code class="docutils literal"><span class="pre">www.origin.com</span></code>. Per the DNS SPEC, this response has a Time To Live (TTL), which indicates how long this mapping can be cached at the LDNS server. In the example, the IP address found by the LDNS server for www.origin.com is 44.33.22.11.</li>
+</ol>
+<blockquote>
+<div><div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">While longer DNS TTLs of a day (86400 seconds) or more are quite common in other use cases, in CDN use cases DNS TTLs are often below a minute.</p>
+</div>
+</div></blockquote>
+<ol class="arabic" start="3">
+<li><p class="first">The client opens a TCP connection from a random port locally to port 80 (the HTTP default) on 44.33.22.11, and sends this (showing the minimum HTTP 1.1 request, typically there are additional headers):</p>
+<div class="highlight-python"><div class="highlight"><pre>GET /foo/bar/fun.html HTTP/1.1
+Host: www.origin.com
+</pre></div>
+</div>
+</li>
+<li><p class="first">The server at <code class="docutils literal"><span class="pre">www.origin.com</span></code> looks up the Host: header to match that to a configuration section, usually referred to as a virtual host section. If the Host: header and configuration section match, the search continues for the content of the path <code class="docutils literal"><span class="pre">/foo/bar/fun.html</span></code>, in the example, this is a file that contains <code class="docutils literal"><span class="pre"><html><body>This</span> <span class="pre">is</span> <span class="pre">a</span> <span class="pre">fun</span> <span class="pre">file</body></html></span></code>, so the server responds with the following:</p>
+<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK
+Content-Type: text/html; charset=UTF-8
+Content-Length: 45
+
+<html><body>This is a fun file</body></html>
+</pre></div>
+</div>
+</li>
+</ol>
+<blockquote>
+<div>At this point, HTTP transaction is complete.</div></blockquote>
+</div>
+
+
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+ <footer>
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----------------------------------------------------------------------
diff --git a/docs/1.8.0/basics/index.html b/docs/1.8.0/basics/index.html
new file mode 100644
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@@ -0,0 +1,267 @@
+
+
+<!DOCTYPE html>
+<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
+<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+ <title>CDN Basics — Traffic Control 1.8.0 documentation </title>
+
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+
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+
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+ <link rel="stylesheet" href="../_static/theme_overrides.css" type="text/css" />
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+ <link rel="top" title="Traffic Control 1.8.0 documentation" href="../index.html"/>
+ <link rel="next" title="Content Delivery Networks" href="content_delivery_networks.html"/>
+ <link rel="prev" title="Traffic Control" href="../index.html"/>
+
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+ <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
+ <input type="text" name="q" placeholder="Search docs" />
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+
+
+
+ <ul class="current">
+<li class="toctree-l1 current"><a class="current reference internal" href="">CDN Basics</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="content_delivery_networks.html">Content Delivery Networks</a></li>
+<li class="toctree-l2"><a class="reference internal" href="http_11.html">HTTP 1.1</a></li>
+<li class="toctree-l2"><a class="reference internal" href="caching_proxies.html">Caching Proxies</a></li>
+<li class="toctree-l2"><a class="reference internal" href="cache_revalidation.html">Cache Control Headers and Revalidation</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">Traffic Control Overview</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../overview/introduction.html">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_ops.html">Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_portal.html">Traffic Portal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_router.html">Traffic Router</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_monitor.html">Traffic Monitor</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_stats.html">Traffic Stats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_server.html">Traffic Server</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_vault.html">Traffic Vault</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">Administrator’s Guide</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_install.html">Installing Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_config.html">Configuring Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_using.html">Using Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_extensions.html">Managing Traffic Ops Extensions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_portal.html">Traffic Portal Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_monitor.html">Traffic Monitor Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_router.html">Traffic Router Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_stats.html">Traffic Stats Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_server.html">Traffic Server Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_vault.html">Traffic Vault Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/quick_howto/index.html">Quick How To Guides</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Developer’s Guide</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_ops.html">Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_portal.html">Traffic Portal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_router.html">Traffic Router</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_monitor.html">Traffic Monitor</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_stats.html">Traffic Stats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../development/traffic_server.html">Traffic Server</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../faq/index.html">FAQ</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../faq/general.html">General</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../faq/development.html">Development</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../faq/administration.html">Running a Traffic Control CDN</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../glossary.html">Glossary</a></li>
+</ul>
+
+
+
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+ <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
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+ <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
+ <a href="../index.html">Traffic Control</a>
+ </nav>
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+
+
+ <div class="wy-nav-content">
+ <div class="rst-content">
+ <div role="navigation" aria-label="breadcrumbs navigation">
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+ <li><a href="../index.html">Traffic Control 1.8.0</a> »</li>
+
+ <li>CDN Basics</li>
+ <li class="wy-breadcrumbs-aside">
+
+ <a href="../_sources/basics/index.txt" rel="nofollow"> View page source</a>
+
+ </li>
+ </ul>
+ <hr/>
+</div>
+
+ <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
+
+ <a href="content_delivery_networks.html" class="btn btn-neutral float-right" title="Content Delivery Networks">Next <span class="fa fa-arrow-circle-right"></span></a>
+
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+ <a href="../index.html" class="btn btn-neutral" title="Traffic Control"><span class="fa fa-arrow-circle-left"></span> Previous</a>
+
+ </div>
+
+ <div role="main" class="document">
+
+ <div class="section" id="cdn-basics">
+<h1>CDN Basics<a class="headerlink" href="#cdn-basics" title="Permalink to this headline">�</a></h1>
+<p>Traffic Control is a CDN control plane, see the topics below to familiarize yourself with the basic concepts of a CDN.</p>
+<div class="toctree-wrapper compound">
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="content_delivery_networks.html">Content Delivery Networks</a></li>
+<li class="toctree-l1"><a class="reference internal" href="http_11.html">HTTP 1.1</a></li>
+<li class="toctree-l1"><a class="reference internal" href="caching_proxies.html">Caching Proxies</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="caching_proxies.html#arrow-reverse-proxy"> Reverse Proxy</a></li>
+<li class="toctree-l2"><a class="reference internal" href="caching_proxies.html#arrow-forward-proxy"> Forward Proxy</a></li>
+<li class="toctree-l2"><a class="reference internal" href="caching_proxies.html#arrow-transparent-proxy"> Transparent Proxy</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="cache_revalidation.html">Cache Control Headers and Revalidation</a></li>
+</ul>
+</div>
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+ <a href="../index.html" class="btn btn-neutral" title="Traffic Control"><span class="fa fa-arrow-circle-left"></span> Previous</a>
+
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+
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+ var DOCUMENTATION_OPTIONS = {
+ URL_ROOT:'../',
+ VERSION:'1.8.0',
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+ };
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http://git-wip-us.apache.org/repos/asf/incubator-trafficcontrol-website/blob/ee296175/docs/1.8.0/development/index.html
----------------------------------------------------------------------
diff --git a/docs/1.8.0/development/index.html b/docs/1.8.0/development/index.html
new file mode 100644
index 0000000..553674d
--- /dev/null
+++ b/docs/1.8.0/development/index.html
@@ -0,0 +1,309 @@
+
+
+<!DOCTYPE html>
+<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
+<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
+<head>
+ <meta charset="utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+ <title>Developer\u2019s Guide — Traffic Control 1.8.0 documentation </title>
+
+
+
+
+ <link rel="shortcut icon" href="../_static/favicon.ico"/>
+
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+ <link rel="stylesheet" href="../_static/theme_overrides.css" type="text/css" />
+
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+
+ <link rel="top" title="Traffic Control 1.8.0 documentation" href="../index.html"/>
+ <link rel="next" title="Traffic Ops" href="traffic_ops.html"/>
+ <link rel="prev" title="Configure Delivery Service Steering" href="../admin/quick_howto/steering.html"/>
+
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+ <script src="_static/js/modernizr.min.js"></script>
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+ <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
+ <input type="text" name="q" placeholder="Search docs" />
+ <input type="hidden" name="check_keywords" value="yes" />
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+ </form>
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+
+
+
+ <ul>
+<li class="toctree-l1"><a class="reference internal" href="../basics/index.html">CDN Basics</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../basics/content_delivery_networks.html">Content Delivery Networks</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../basics/http_11.html">HTTP 1.1</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../basics/caching_proxies.html">Caching Proxies</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../basics/cache_revalidation.html">Cache Control Headers and Revalidation</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">Traffic Control Overview</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../overview/introduction.html">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_ops.html">Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_portal.html">Traffic Portal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_router.html">Traffic Router</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_monitor.html">Traffic Monitor</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_stats.html">Traffic Stats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_server.html">Traffic Server</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_vault.html">Traffic Vault</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">Administrator’s Guide</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_install.html">Installing Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_config.html">Configuring Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_using.html">Using Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_extensions.html">Managing Traffic Ops Extensions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_portal.html">Traffic Portal Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_monitor.html">Traffic Monitor Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_router.html">Traffic Router Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_stats.html">Traffic Stats Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_server.html">Traffic Server Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_vault.html">Traffic Vault Administration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../admin/quick_howto/index.html">Quick How To Guides</a></li>
+</ul>
+</li>
+</ul>
+<ul class="current">
+<li class="toctree-l1 current"><a class="current reference internal" href="">Developer’s Guide</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html">Traffic Ops</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_portal.html">Traffic Portal</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html">Traffic Router</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html">Traffic Monitor</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_stats.html">Traffic Stats</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_server.html">Traffic Server</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../faq/index.html">FAQ</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../faq/general.html">General</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../faq/development.html">Development</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../faq/administration.html">Running a Traffic Control CDN</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../glossary.html">Glossary</a></li>
+</ul>
+
+
+
+ </div>
+
+ </nav>
+
+ <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
+
+
+ <nav class="wy-nav-top" role="navigation" aria-label="top navigation">
+ <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
+ <a href="../index.html">Traffic Control</a>
+ </nav>
+
+
+
+ <div class="wy-nav-content">
+ <div class="rst-content">
+ <div role="navigation" aria-label="breadcrumbs navigation">
+ <ul class="wy-breadcrumbs">
+ <li><a href="../index.html">Traffic Control 1.8.0</a> »</li>
+
+ <li>Developer’s Guide</li>
+ <li class="wy-breadcrumbs-aside">
+
+ <a href="../_sources/development/index.txt" rel="nofollow"> View page source</a>
+
+ </li>
+ </ul>
+ <hr/>
+</div>
+
+ <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
+
+ <a href="traffic_ops.html" class="btn btn-neutral float-right" title="Traffic Ops">Next <span class="fa fa-arrow-circle-right"></span></a>
+
+
+ <a href="../admin/quick_howto/steering.html" class="btn btn-neutral" title="Configure Delivery Service Steering"><span class="fa fa-arrow-circle-left"></span> Previous</a>
+
+ </div>
+
+ <div role="main" class="document">
+
+ <div class="section" id="developer-s-guide">
+<h1>Developer’s Guide<a class="headerlink" href="#developer-s-guide" title="Permalink to this headline">�</a></h1>
+<p>Use this guide to start developing applications that consume the Traffic Control APIs, to create extensions to Traffic Ops, or work on Traffic Control itself.</p>
+<div class="toctree-wrapper compound">
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="traffic_ops.html">Traffic Ops</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#introduction">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#software-requirements">Software Requirements</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#traffic-ops-project-tree-overview">Traffic Ops Project Tree Overview</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#perl-formatting-conventions">Perl Formatting Conventions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#database-management">Database Management</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#installing-the-developer-environment">Installing The Developer Environment</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#test-cases">Test Cases</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#extensions">Extensions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_ops.html#api">API</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="traffic_portal.html">Traffic Portal</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="traffic_portal.html#introduction">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_portal.html#software-requirements">Software Requirements</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_portal.html#traffic-portal-project-tree-overview">Traffic Portal Project Tree Overview</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_portal.html#installing-the-traffic-portal-developer-environment">Installing The Traffic Portal Developer Environment</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_portal.html#notes">Notes</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="traffic_router.html">Traffic Router</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html#introduction">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html#software-requirements">Software Requirements</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html#traffic-router-project-tree-overview">Traffic Router Project Tree Overview</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html#java-formatting-conventions">Java Formatting Conventions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html#installing-the-developer-environment">Installing The Developer Environment</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html#test-cases">Test Cases</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html#rpm-packaging">RPM Packaging</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_router.html#api">API</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="traffic_monitor.html">Traffic Monitor</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html#introduction">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html#software-requirements">Software Requirements</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html#traffic-monitor-project-tree-overview">Traffic Monitor Project Tree Overview</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html#java-formatting-conventions">Java Formatting Conventions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html#installing-the-developer-environment">Installing The Developer Environment</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html#test-cases">Test Cases</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html#api">API</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="traffic_stats.html">Traffic Stats</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="traffic_stats.html#introduction">Introduction</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_stats.html#software-requirements">Software Requirements</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_stats.html#traffic-stats-project-tree-overview">Traffic Stats Project Tree Overview</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_stats.html#go-formatting-conventions">Go Formatting Conventions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_stats.html#installing-the-developer-environment">Installing The Developer Environment</a></li>
+<li class="toctree-l2"><a class="reference internal" href="traffic_stats.html#test-cases">Test Cases</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="traffic_server.html">Traffic Server</a></li>
+</ul>
+</div>
+</div>
+
+
+ </div>
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+
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+
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