Re: [lwip-users] httpd fails due to LWIP_HTTPD_REQ_BUFSIZE

[address@hidden]

Am 24.04.2020 um 21:02 schrieb hondgm--- via lwip-users:
> I'm using lwip 2.0.3 with httpd and when submitting one of my webpage
> forms (using "type="submit"") the web browser complains lwip/httpd
> didn't send any data. 
>
> Upon further investigation, the issue is in httpd.c:
>
> #if LWIP_HTTPD_SUPPORT_REQUESTLIST
>   clen = pbuf_clen(hs->req);
>   if ((hs->req->tot_len <= LWIP_HTTPD_REQ_BUFSIZE) &&
>     (clen <= LWIP_HTTPD_REQ_QUEUELEN)) {
>
>
> hs->req->tot_len is longer than LWIP_HTTPD_REQ_BUFSIZE, which is 1023
> because of:
>
> #define LWIP_HTTPD_MAX_REQ_LENGTH           LWIP_MIN(1023,
> (LWIP_HTTPD_REQ_QUEUELEN * PBUF_POOL_BUFSIZE))
>
>
> I tried increasing LWIP_HTTPD_MAX_REQ_LENGTH  to a higher value, but it
> caused an exception. What is the proper way to deal with this?

Increaseing LWIP_HTTPD_MAX_REQ_LENGTH *is* the proper way to handle
requests that are longer and not sent in one packet.

You'll need to debug the cause of that exception (which is not expected).

Regards,
Simon