[Mono-bugs] [Bug 597556] New: HttpWebRequest doesn't ignore chunk-extension in chunked encoding

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sat Apr 17 01:48:19 EDT 2010



           Summary: HttpWebRequest doesn't ignore chunk-extension in
                    chunked encoding
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.6.x
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Minor
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: brian at sooloos.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US)
AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.9 Safari/533.2

see http/1.1 docs here:

It is legal for an HTTP/1.1 server to send an optional chunk-extension after a
chunk-size. The chunk decoder in the GetChunkSize method in ChunkStream.cs is
clearly just reading the chunk header until it sees \r\n and trying to parse
the result as a HexNumber directly. 

This fails if the chunk has a chunk-extension since the string being parsed
would look like "1A0; foo\r\n" instead of the more common "1A0\r\n". 

The chunk decoder should instead read up to a semicolon OR \r\n, parse those
characters as a hex number, then in the case where it read up to a semicolon,
discard bytes until an \r\n is encountered. 

Reproducible: Always

Steps to Reproduce:
1. set up a webrequest to a server that sends chunk-extension
2. call GetResponse() on it
3. call GetResponseStream() on the response
4. call Read(...) on the stream.

Actual Results:  
mono http stack throws a protocol violation "Cannot parse chunk size."

Expected Results:  
mono reads the data sent by the server, ignoring the chunk-extension

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