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Editorial Team
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Asked: 2026-05-30T16:44:52+00:00

This issue is happening on a Red Hat instance. The apache installed is version

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This issue is happening on a Red Hat instance. The apache installed is version [Apache/2.2.19] and the mod_ssl version is [2.2.16.]
HTTP access works fine, but when mod_rewrite is enabled for http to https redirection, it results in following 400 Error:

Bad Request

Your browser sent a request that this server could not understand.
Request header field is missing ':' separator.

The error in Apache’s error_log file is:

request failed: error reading the headers

The similar setup is working in another environment. Can someone please help me to resolve this.

Thanks
Noman A.

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1 Answer

  1. Editorial Team

    Found solution for this.

    It appears that the reboot of the system updated my yum packages, including httpd [2.2.22] which was conflicting with my Apache installation [2.2.19].

    I updated the mod_ssl.so [2.2.16] in my Apache to mod_ssl.so [2.2.22] and the error was resolved.

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