strict content length does not apply if content length header is set after body

[ronag]

If the content length is set after data has been written to the OutgoingMessage, but before headers have been flushed, then the strict content length check is bypassed.

[marco-ippolito]

I can work on this

[marco-ippolito]

this is the pr where res.strictContentLength the #44378 but it has not been documented in http.md. I'll add it

[marco-ippolito]

@ronag could you please provide an example? I'm not sure how to set headers after a res.write since it will always throw ERR_HTTP_HEADERS_SENT

[ronag]

You are right. My mistake.