Hey Heiko,

I dug into the source code at this point recently, and unfortunately I 
don't think that what you need is easily possible without changing the 
library.
Some headers (Content-Length, Content-Type, Transfer-Encoding) are consumed 
by the HttpMessageParser without exposing them via the request's "headers" 
field later.
This happens during the "parsing" stage in HttpServerBluePrint, which 
consumes the incoming ByteStrings. Neither the HttpServerBluePrint nor the 
underlying HttpRequestParser/HttpMessageParser are injectable without 
copying substantial parts of the library code into your application, as far 
as I can see.
If you can use a patched version of Akka HTTP, I'd probably change the 
recursive call in HttpMessageParser::parseHeaderLines to pass "headers += 
h" for the Content-Type case, then you have access to the interpreted 
header through httpRequest.entity.contentType and to the raw header via 
httpRequest.headers.

Urs

On Thursday, March 1, 2018 at 8:58:10 PM UTC+1, Heiko Seeberger wrote:
>
> Nobody?
>
> Am 24.02.2018 um 19:12 schrieb Heiko Seeberger <loe...@posteo.de 
> <javascript:>>:
>
> Hey, Akka HTTP experts, 
>
> Akka HTTP treats the Content-Type header in a special way (seemingly 
> according to the spedification). In particular if the request contains 
> neither a Content-Type header nor entity data, it sets the Content-Type to 
> "application/octet-stream“.
>
> This seems to be in sync with the HTTP spec (7.2.1). Is there a way to see 
> that the raw request did not contain the Content-Type header?
>
> Thanks
> Heiko
>
> --
>
> Heiko Seeberger
> Home: heikoseeberger.de
> Twitter: @hseeberger
> Public key: keybase.io/hseeberger
>
>
>
>
>
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