IPP> Chunked POST

IPP> Chunked POST

IPP> Chunked POST

Roy T. Fielding fielding at kiwi.ics.uci.edu
Fri Dec 18 01:03:24 EST 1998


>In my opinion, Ken Coar is correct in saying that for a server to
>be *both* HTTP/1.1 compliant and CGI/1.1 compliant it MUST buffer 
>chunked POST data and provide a Content-Length for the CGI script.

Sending 411 is HTTP/1.1 compliant.  Failure to parse the chunked
encoding (and puking) would be non-compliance, but requiring a
content-length for a given resource is necessary for many reasons
(DoS and legacy system protection).

>My recollection is that some servers chose not to be completely 
>CGI/1.1 compliant to avoid the buffering.  The 411 header was a
>way to be HTTP/1.1 compliant and indicate their rejection of 
>chunked POST data.
>
>For example, I have heard that Apache rejects chunked POST data,
>but I have not personally verified this.

Right, the default mod_cgi distributed with Apache will respond with
411 because it assumes the CGI is dumb.  The core of Apache does support
chunked reading, so one could always write a module that reads chunked,
but CGI requires a content-length before the script is execed.
A module that does limited-size buffering before handing over to the CGI
script has been on my Apache to-do list for a long time (over a year).

....Roy



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