Hi all, I'm running Squid 2.7.STABLE3. I just moved off of 2.6.STABLE12. We run a USPS webapp called Shipping Assistant. With 2.6, this app worked fine. During my upgrade, I introduced no config changes. With 2.7, this app is broken. Comparing a tcpdump of the app talking direct and then the app talking to squid, it appears that squid borks over HTTP 1.1 (or the "Expect" directive) and throws an invalid request error (ERR_INVALID_REQ 0). Here is a bit of the short conversation between the app and squid: --begin-- POST http://production.shippingapis.com/ShippingApi.dll HTTP/1.1 Content-Type: application/x-www-form-urlencoded Host: production.shippingapis.com Content-Length: 395 Expect: 100-continue Proxy-Connection: Keep-Alive HTTP/1.0 417 Expectation failed Server: squid/2.7.STABLE3 Date: Thu, 08 Jan 2009 15:50:16 GMT Content-Type: text/html Content-Length: 1402 Expires: Thu, 08 Jan 2009 15:50:16 GMT X-Squid-Error: ERR_INVALID_REQ 0 X-Cache: MISS from squidserver X-Cache-Lookup: NONE from squidserver:3128 Via: 1.0 squidserver:3128 (squid/2.7.STABLE3) Connection: keep-alive Proxy-Connection: keep-alive POST http://production.shippingapis.com/ShippingApi.dll HTTP/1.1 Content-Type: application/x-www-form-urlencoded Host: production.shippingapis.com Content-Length: 395 Expect: 100-continue Proxy-Connection: Keep-Alive HTTP/1.0 417 Expectation failed Server: squid/2.7.STABLE3 Date: Thu, 08 Jan 2009 15:50:16 GMT Content-Type: text/html Content-Length: 1402 Expires: Thu, 08 Jan 2009 15:50:16 GMT X-Squid-Error: ERR_INVALID_REQ 0 X-Cache: MISS from squidserver X-Cache-Lookup: NONE from squidserver:3128 Via: 1.0 squidserver:3128 (squid/2.7.STABLE3) Connection: keep-alive Proxy-Connection: keep-alive --end-- I'd attach the dumps, but they contain account related data. Any thoughts appreciated. Kind Regards, -- Christopher Nighswonger Faculty Member Network & Systems Director Foundations Bible College & Seminary www.foundations.edu www.fbcradio.org