busybox wget Transfer-Encoding chunked

[Steve W.]

Hi,

I experience an issue with Busybox wget running on a Openwrt box,
version "BusyBox v1.28.3". When sending a POST request wget uses
Transfer-Encoding "chunked" and does not provide Content-Length

The issue is that my web application expects Content-Length and does not
support chunked transfer

Here is an example:

wget --post-data="a=b" http://httpbin.org/post -O -

Gives:

"headers": {
    "Connection": "close",
    "Content-Type": "application/x-www-form-urlencoded",
    "Host": "httpbin.org [1]",
    "Transfer-Encoding": "chunked",
    "User-Agent": "uclient-fetch"

The payload string "a=b" is of known length so there should be no
problem to provide the content length. And I checked standard wget
implementation (shipped with Ubuntu 16.04) - it does not use chunked
transfer and correctly specifies the content length

 "headers": {
    "Accept": "*/*",
    "Accept-Encoding": "identity",
    "Connection": "close",
    "Content-Length": "3",
    "Content-Type": "application/x-www-form-urlencoded",
    "Host": "httpbin.org [1]",
    "User-Agent": "Wget/1.17.1 (linux-gnueabihf)"

Is that because of some custom compile flags used by Openwrt?
Is there a way to make busybox to supply content-length during POST
request?

Thanks,
Steve 

Links:
------
[1] http://httpbin.org
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