https://bz.apache.org/bugzilla/show_bug.cgi?id=64919
Bug ID: 64919
Summary: mod_proxy_fcgi fails to parse headers with a string
length over 8192
Product: Apache httpd-2
Version: 2.4.46
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_proxy_fcgi
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 37560
--> https://bz.apache.org/bugzilla/attachment.cgi?id=37560&action=edit
A PHP script with a long header.
We've recently run into an issue on a live site running the magento shopping
cart software. With Magento there are cases where the headers have string
lengths longer than 8192 characters. These long headers are causing
mod_proxy_fcgi to fail parsing the headers.
Steps to Reproduce:
1.) Configure mod_proxy_fcgi to send php request to a local php-fpm service
2.) Create a php page with a header string longer than 8192 (example is
attached).
3.) Load the page.
Expected Outcome:
Page renders "this is a test, only a test"
Actual Outcome:
Page fails to load with ERR_INVALID_RESPONSE and the following error in
error_log:
[Mon Nov 09 20:56:23 2020] [proxy_fcgi:error] [pid 15169:tid 139991975950080]
[client 31.125.74.55:39714] Premature end of script headers: bh.php
[Mon Nov 09 20:56:23 2020] [proxy_fcgi:error] [pid 15169:tid 139991975950080]
[client 31.125.74.55:39714] AH01070: Error parsing script headers
[Mon Nov 09 20:56:23 2020] [proxy_fcgi:error] [pid 15169:tid 139991975950080]
(22)Invalid argument: [client 31.125.74.55:39714] AH01075: Error dispatching
request to :
We've found a work-around that involves changing the compile time limit
(increasing HUGE_STRING_LEN in httpd.h), but we don't assume that is the
recommended way to solve this issue.
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