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PK96410: IBM HTTP Server- intermittent error reading status line with http proxy

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Abstract

"proxy: error reading status line from remote server" appears in the error log intermittently

Download Description

PK96410 resolves the following problem:

ERROR DESCRIPTION:
Intermittent proxy reading status error in log.
proxy: error reading
status line from remote server

LOCAL FIX:
N/A

PROBLEM SUMMARY

USERS AFFECTED:
Users of IBM HTTP Server with mod_proxy_http configured

PROBLEM DESCRIPTION:
"proxy: error reading status line from remote server" appears in the error log intermittently

RECOMMENDATION:
Apply this fix if mod_proxy_http is configured

When mod_proxy_http is using keepalive for pooled back end connections, a race condition can occur where the back end server decides to close the connection at about the same time that mod_proxy_http sends a new HTTP request on this same connection. The proxied request can fail and HTTP status code 502 may appear at the browser. "proxy: error reading status line from remote server" appears in the IBM HTTP Server error log.

This problem is described by PR 37770 in Apache bugzilla
https://issues.apache.org/bugzilla/show_bug.cgi?id=37770

PROBLEM CONCLUSION:
IBM HTTP Server is updated with the fix for rev. 657443 from Apache httpd 2.2.x. Basically when this race condition occurs, IBM HTTP Server will close the front end connection to the browser which knows how to retry in this situation.

This fix is scheduled for inclusion in IBM HTTP Server fix pack 7.0.0.9.

Prerequisites

None

Installation Instructions

Please review the readme.txt for detailed installation instructions.

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On
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Technical Support

Contact IBM Support using SR (http://www.ibm.com/software/support/probsub.html), visit the IBM HTTP Server Support Web site (http://www.ibm.com/software/webservers/httpservers/support/), or contact 1-800-IBM-SERV (U.S. only).

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Document Information

Modified date:
07 December 2019

UID

swg24024560