Question about ChunkedMessageEnd

[Leon Ma]

Hi,

In ChunkedMessageEnd definition:

case class ChunkedMessageEnd(extension: String = "",
                             trailer: List[HttpHeader] = Nil) extends HttpRequestPart with HttpResponsePart with HttpMessageEnd {

What's the purpose for extension and trailer (how does they impact on the final output)?

If I generate some HttpHeader in trailer, will these headers finally output to browser?

Thanks

Ma Ling

[Mathias Doenitz]

Leon,

the trailer headers are a feature of HTTP (http://tools.ietf.org/html/rfc7230#section-4.1.2), which spray must support in order to be able to call itself HTTP-compliant.
My impression is that trailer headers aren’t that widely used in the wild (similarly to chunk extensions) but I might be wrong.
Maybe someone else can comment on a real-world use case?

Cheers,
Mathias

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[Leon Ma]

Thanks a lot !

Then maybe I can use the trailer header to store some statistics like total size of all chunks.

在 2015年3月9日星期一 UTC-7上午2:48:44，Mathias写道：