fix(http): fix invalid content-length header in http get (IDFGH-13571)

[TeXniKK]

According to RFC9110 Section 8.6 "Content-Length":
A user agent SHOULD NOT send a Content-Length header field when the request message does not contain content and the method semantics do not anticipate such data.

This fix removes invalid(empty) Content-Length header for HTTP GET requests.

Presence of this header is causing error 400 to be returned by AWS services via secure connection in some cases:

D (90345) HTTP_CLIENT: Write header[3]: GET /feed HTTP/1.1
User-Agent: IotDevice
Host: <servername>
Content-Length: 0
D (90651) HTTP_CLIENT: on_message_begin
D (90652) HTTP_CLIENT: HEADER=Server:awselb/2.0
D (90652) HTTP_CLIENT: HEADER=Date:Mon, 19 Aug 2024 18:55:53 GMT
D (90653) HTTP_CLIENT: HEADER=Content-Type:text/html
D (90655) HTTP_CLIENT: HEADER=Content-Length:122
D (90656) HTTP_CLIENT: HEADER=Connection:close
D (90656) HTTP_CLIENT: http_on_headers_complete, status=400, offset=150, nread=150
D (90656) HTTP_CLIENT: http_on_body 122
D (90657) HTTP_CLIENT: http_on_message_complete, parser=3f81f998
D (90657) HTTP_CLIENT: content_length = 122
D (90657) HTTP_CLIENT: Close connection
I (90661) OTA: HTTP GET Status = 400, content_length = 122```

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[snake-4]

§ 9.3.1 states that content within GET request is allowed if the origin server indicates that it supports such requests. Maybe there should be an option to keep the header?

You could also add HEAD and DELETE requests to the check as they have the same wording within the RFC (§ 9.3.2 and § 9.3.5).

[TeXniKK]

Agreed. Updated PR with checks for HEAD and DELETE. Also added a check on write_len != 0 to support unlike case where these requests would actually have a body.

[nileshkale123]

sha=c87cb854f3205cb3f1c69f31ac654a4f278d5628