So we have a development team that writes web apps in .NET. We use
Apache 2.2.14 on Linux for a reverse proxy to their app. I am very
confused by the Apache response, and wonder if it's a bug in the apache
code or mod_proxy code.
The developers are posting the following to their app, through our proxy
server:
========================================
POST /foo/bar.asmx HTTP/1.1
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://foo2/bar2";
Host: foofoo.barbar.com
Content-Length: 235
Expect: 100-continue
Connection: Keep-Alive
========================================
Apache responds back with:
========================================
HTTP/1.1 417 Expectation Failed
Date: Fri, 06 Aug 2010 20:30:23 GMT
Content-Length: 440
Keep-Alive: timeout=3, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head>
<title>417 Expectation Failed</title>
</head><body>
<h1>Expectation Failed</h1>
<p>The expectation given in the Expect request-header field could not be
met by this server.
The client sent<pre>
Expect: 100-continue
</pre>
</p><p>Only the 100-continue expectation is supported.</p> <hr>
<address>Apache Server at foofoo.barbar.com Port 80</address>
</body></html> ========================================
My confusion is that Apache is saying it only supports "100-continue",
and yet that is exactly what the client sent. Can anyone clear this up?
Next, I tried to use mod_headers to "unset" the "Expect" RequestHeader
value. It is successfully unsetting the value, but leaving it blank,
and then Apache complains about a blank "Expect" request.
Does anyone have any suggestions on how I can either fix, remove, or get
around this "Expect 100-continue" issue? I can't have development
modify all of their code, and am pretty sure I can just nuke the
"Expect" value in the headers, if I could get that to work...
Thanks for any advice.
Scott
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