[trafficserver] branch 7.1.x updated: Stop connection reattempts on origin which sends EOS on no data.

[zw...@apache.org]

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zwoop pushed a commit to branch 7.1.x
in repository https://gitbox.apache.org/repos/asf/trafficserver.git


The following commit(s) were added to refs/heads/7.1.x by this push:
     new 6d19409  Stop connection reattempts on origin which sends EOS on no data.
6d19409 is described below

commit 6d19409f9aa78c71419aaf09fc309e0075c555f7
Author: Susan Hinrichs <sh...@apache.org>
AuthorDate: Mon Mar 12 10:21:02 2018 -0500

    Stop connection reattempts on origin which sends EOS on no data.
    
    (cherry picked from commit bba6321e6305f6321ebb5d571c5ad382ab3acf20)
---
 proxy/http/HttpSM.cc | 21 +++++----------------
 1 file changed, 5 insertions(+), 16 deletions(-)

diff --git a/proxy/http/HttpSM.cc b/proxy/http/HttpSM.cc
index 0b2737c..13600d1 100644
--- a/proxy/http/HttpSM.cc
+++ b/proxy/http/HttpSM.cc
@@ -1789,16 +1789,6 @@ HttpSM::state_read_server_response_header(int event, void *data)
   case VC_EVENT_EOS:
     server_entry->eos = true;
 
-    // If no bytes were transmitted, the parser treats
-    // as a good 0.9 response which is technically is
-    // but it's indistinguishable from an overloaded
-    // server closing the connection so don't accept
-    // zero length responses
-    if (vio->ndone == 0) {
-      // Error handling function
-      handle_server_setup_error(event, data);
-      return 0;
-    }
   // Fall through
   case VC_EVENT_READ_READY:
   case VC_EVENT_READ_COMPLETE:
@@ -1839,12 +1829,11 @@ HttpSM::state_read_server_response_header(int event, void *data)
 
   server_response_hdr_bytes += bytes_used;
 
-  // Don't allow 0.9 (unparsable headers) on keep-alive connections after
-  //  the connection has already served a transaction as what we are likely
-  //  looking at is garbage on a keep-alive channel corrupted by the origin
-  //  server
-  if (state == PARSE_RESULT_DONE && t_state.hdr_info.server_response.version_get() == HTTPVersion(0, 9) &&
-      server_session->transact_count > 1) {
+  // Don't allow HTTP 0.9 (unparsable headers) on resued connections.
+  // And don't allow empty headers from closed connections
+  if ((state == PARSE_RESULT_DONE && t_state.hdr_info.server_response.version_get() == HTTPVersion(0, 9) &&
+       server_session->transact_count > 1) ||
+      (server_entry->eos && vio->ndone == 0)) {
     state = PARSE_RESULT_ERROR;
   }
   // Check to see if we are over the hdr size limit

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