A packet capture will also show this information, key information to look for in the packet capture:
Hypertext Transfer Protocol
HTTP/1.0 417 Expectation failed\r\n
X-Squid-Error: ERR_INVALID_REQ 0
X-Cache: MISS from ClientSiteProxy
Many applications rely on using a special HTTP/1.1 header (Expect:100-continue) when doing a POST, which is not supported by Squid NT version, which is used by our Client Site Proxy.
To have the client site proxy server ignore any Expect: 100-contine header present in the request, you will need to add the following lines under "acl HEAD Method HEAD" in the ACLs section of C:\ClientSiteProxy\etc\squid.conf file.
# TAG: Ignore any Expect: 100-continue header sent from third-party applications ignore_expect_100 on
After you have completed the configuration changes, make sure you restart the Client Site Proxy service for the changes to take effect
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