Apache - Convert underscores to dashes in headers

Question

In a project a had to run CA Webagent Siteminder which sends me legacy headers with underscores. Since Apache 2.4 underscores are deprecated and dropped silently.

I need a workaround via mod_headers which converts all underscores _ to dashes - in the request-header.

Before

legacy_header_one
legacy_header_two
legacy_header_three

After

legacy-header-one
legacy-header-two
legacy-header-three

Are you trying to convert the header names or the header values or both? — covener, Mar 28 '17 at 13:25

score 2 · Accepted Answer · answered Dec 18 '17 at 14:34

You have two options here:

Apache Bypass

# 
# The following works around a client sending a broken Accept_Encoding
# header.
#
SetEnvIfNoCase ^Accept.Encoding$ ^(.*)$ fix_accept_encoding=$1
RequestHeader set Accept-Encoding %{fix_accept_encoding}e env=fix_accept_encoding

Siteminder Bypass

#its not explicitly stated but im assuming this should be in your WebAgent.conf file
LegacyVariables="NO"

EDIT:

I know this doesn't directly answer your question of converting from _ to - but it is an answer to help mitigate the Apache 2.4 vs. CA Siteminder header issue.

score 0 · Answer 2 · answered Mar 28 '17 at 02:23

0

In your virtualhost config:

SetEnvIfNoCase ^OAM.REMOTE.USER$ ^(.*)$ fix_accept_encoding=$1
RequestHeader set OAM-REMOTE-USER %{fix_accept_encoding}e env=fix_accept_encoding

If you are using mod_wsgi for Django or Flask, you will need to add:

WSGIPassAuthorization On

answered Mar 28 '17 at 02:23

lax1089

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This only converts one specific header-variable to lowercase, doesn't it? – Roman Mar 29 '17 at 14:00

Apache - Convert underscores to dashes in headers

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