[jira] [Created] (HTTPCLIENT-1493) Conditional stale connection checking

["Sebb (JIRA)" <ji...@apache.org>]

Sebb created HTTPCLIENT-1493:
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             Summary: Conditional stale connection checking
                 Key: HTTPCLIENT-1493
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1493
             Project: HttpComponents HttpClient
          Issue Type: New Feature
            Reporter: Sebb


Stale connection checking is expensive. At present if it is enabled, it is performed for every connection. This is quite expensive and generates additional requests.

One reason for a server to drop a connection is when the connection has been idle for a while. Some servers send Keep-Alive headers to inform the client of this; if they don't, then the client will see an unexpected disconnection. Stale connection checking avoids this problem, but at the cost of additional requests. When a connection is not busy, this is acceptable, but for a busy connection the checks are mostly unnecessary.

Another reason for dropping a connection is after it has been reused many times. The server should send a connection close as part of the final response, but if it does not, a stale check would help.

For these reasons, it would be useful to be able to implement conditional stale connection checking, based on connection idle time and/or connection reuse count. These conditions should be optionally selectable.



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