[jira] Commented: (MODPYTHON-222) Support for chunked transfer encoding on request content.

["Michael Barton (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MODPYTHON-222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642604#action_12642604 ] 

Michael Barton commented on MODPYTHON-222:
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I'd love to see this issue fixed in some manner.  Chunked transfer would be useful for stuff like streaming the output of gzip to the server rather than spooling to disk locally to get the length first.

I don't know enough about mod_python to properly evaluate the above patch, but it's been working for me.

> Support for chunked transfer encoding on request content.
> ---------------------------------------------------------
>
>                 Key: MODPYTHON-222
>                 URL: https://issues.apache.org/jira/browse/MODPYTHON-222
>             Project: mod_python
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 3.3.1
>            Reporter: Graham Dumpleton
>         Attachments: mod_python-211-212-222-fix-revised.patch, requestobject.c
>
>
> It is currently not possible to use chunked transfer encoding on request content delivered to a mod_python request handler.
> The use of chunked transfer encoding is explicitly blocked in C code by:
>         rc = ap_setup_client_block(self->request_rec, REQUEST_CHUNKED_ERROR);
> To allow chunked transfer encoding instead of REQUEST_CHUNKED_ERROR it would be necessary to supply REQUEST_CHUNKED_DECHUNK.
> Problem is that it isn't that simple.
> First off, the problems associated with MODPYTHON-212 have to be fixed with code being able to cope with there being no content length.
> The next issue is that req.read() method is currently documented as behaving as:
>   If the len argument is negative or omitted, reads all data given by the client.
> This means that can't have req.read() with no arguments mean give me everything that is currently available in input buffers as everyone currently expects it to return everything sent by client. Thus, to be able to process streaming data one would have to supply an amount of data that one wants to read. The code for that though will always try to ensure that that exact amount of data is read and will block if not enough and not end of input. A handler though may not want it to block and be happy with just getting what is read and only expect it to block if nothing currently available.
> In other words, the current specification for how req.read() behaves is incompatible with what would be required to support chunked transfer encoding on request content.
> Not sure how this conflict can be resolved.

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