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QuestionHTTPS POST returning 100 Continue makes the WebClient throw protocol violation exception [modified] Pin
Corneliu Tusnea25-Feb-07 13:57
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I use a WebClient to post some data to a server. (.Net 2.0) The server returns back:

HTTP/1.1 100 Continue
Server: Microsoft-IIS/5.0
Date: …

HTTP/1.1 200 OK
Server: Microsoft-IIS/5.0
Content-Type: text/xml;charset=ISO-8859-1
Content-Length: 929

This is valid as per the RFC:[^]

As per the http specs this is a valid way of returning content and is generally used when the server requires more time to process and sends you a 100 Continue.

However from .Net I get the exception:

The server committed a protocol violation. Section=ResponseStatusLine

While processing the response. This seems to because the space in the headers is considered a possible security issue.

This is a bit of chicken and the egg. Header splitting is a security issue however 100 Continue + header splitting is valid as per the specs.[^]

Now reading a bit more I found this nice comment on an MSDN blog:[^]

Clients which advertise to be HTTP/1.1 compliant and then crash on "100 continue" are the real problem (they are not following public specifications)

The “fix” is to add a setting in the web config to disable the checking of split headers:
[...] httpWebRequest useUnsafeHeaderParsing="true" [...]

My problem is that Setting the flag in the config does not make any difference. Setting the flag using reflection does not help either. I still get the exception.

Setting the Enable100Continue property on the ServicePointManager or ServicePoint does not help either. I still get the exception.

Any help is welcome.


-- modified at 19:17 Sunday 25th February, 2007

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