[FS#3378] uhttpd randomly returns "400 Bad request"

[OpenWrt Bugs]

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User who did this - bolvan (bolvan) 

Attached to Project - OpenWrt/LEDE Project
Summary - uhttpd randomly returns "400 Bad request"
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - In recent trunk uhttpd (2020-08-05-212f8364-1) sometimes return http error 400 Bad request

when cl->state==CLIENT_STATE_INIT
ustream_get_read_buf  should read http request starting with method (GET,POST)
and ending with request body

sometimes it reads previous request body followed by current request (GET ...........)
it looks like

GET /cgi-bin/luci/....

then this block is passed to client_init_cb and client_parse_request
client_parse_request return CLIENT_STATE_DONE
and it triggers uh_header_error(cl, 400, "Bad Request");


If I replace uhttpd binary with the one taken from 19.07  problem disappears (had to ln one .so to make it work)

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3378

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