Hi!
We came across a strange "bug" in squid in regards to icap and request_header access.
Thing is that we found out that squid is not "removing" a header as expected (via "request_header_access headername deny all")
If the ICAP server modifies the "case" of the header in the REQMOD response:
Looks like this:
ICAP - RequestMOD - Request:
GET http://<host>/utility/headers HTTP/1.1
User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.14.0.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
Host: <host>
Accept: */*
MS-test: AABBCCDD
ICAP - RequestMOD - Response:
ICAP/1.0 200 OK
Date: Wed, 15 May 2013 10:57:49 GMT
Connection: keep-alive
ISTag: "ReqModService"
Encapsulated: req-hdr=0,null-body=432
GET http://<host>/utility/headers http/1.1
MS-TEST: AABBCCDD
host: <host>
accept: */*
user-agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.14.0.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
and the squid.conf contains:
request_header_access ms-test deny all
so this should strip the ms-test header.
But it does NOT work - the header is added to the proxy request!
ONLY if the icap RequestMod response sends the header in the SAME case as it has been received ("MS-test" vs. "MS-TEST"), the header gets deleted!
At least for our case we have found a workaround by modifying our ICAP server to send the "correct" response header...
Ciao,
Martin
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