[Libwebsockets] HTTP POST Body

Andy Green andy at warmcat.com
Mon Jun 27 19:06:37 CEST 2016



On June 27, 2016 10:59:18 PM GMT+08:00, Srikar Vadlamani <SrikarVadlamani at trafficware.com> wrote:
>Thanks for the reply, 
>When was the form parsing functionality introduced? I am using 2.0.2,
>it doesn’t seem to have it.

It's only a few weeks old, that's why I wrote "On master...".

-Andy

>Lws_spa_xxx
>
>-----Original Message-----
>From: Andy Green [mailto:andy at warmcat.com] 
>Sent: Saturday, June 25, 2016 6:06 PM
>To: Srikar Vadlamani <SrikarVadlamani at trafficware.com>;
>libwebsockets at ml.libwebsockets.org
>Subject: Re: [Libwebsockets] HTTP POST Body
>
>
>
>On June 25, 2016 4:01:04 AM GMT+08:00, Srikar Vadlamani
><SrikarVadlamani at trafficware.com> wrote:
>>Hey,
>>
>>I am seeing that Post Data is being split into 2 BODY callbacks, is it
>
>>normal? If yes, am I supposed to combine data from both callbacks to 
>>make a valid packet?
>>
>>LWS_CALLBACK_HTTP_BODY: {len 1},{N}
>>LWS_CALLBACK_HTTP_BODY: {len
>>40},{ame=Alpha&Email=beta%40com&Submit=Submit}
>>LWS_CALLBACK_HTTP_BODY_COMPLETION
>
>It's "normal" generally, lws passes up what it receives as it receives
>it.
>
>But usually, the guy sending it doesn't do what you show, just send one
>byte first.  Maybe check your rx_buffer_size member of your protocol
>struct is some reasonable number, it defines the max size of the rx
>chunk that will be assembled and passed here.
>
>However it's open to the sender, the receiver and any tcp intermediary
>to fragment tcp packets how it likes, including this.
>
>That is why lws has stateful, bytewise parsers for RX handling in the
>library.  The can deal with fragmentation robustly without buffering.
>
>On master, we have stateful, bytewise POST parsing that will handle
>fragmentation transparently (including file upload case).
>
>Demo: https://libwebsockets.org/testserver/   use the POST tab
>
>Related code:
>https://github.com/warmcat/libwebsockets/blob/master/plugins/protocol_post_demo.c
>
>New Doxygen docs:
>https://libwebsockets.org/lws-api-doc-master/html/group__form-parsing.html
>
>-Andy
>
>>Srikar
>>
>>
>>-----------------------------------------------------------------------
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>>
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