Does any networking API support receiving HTTP trailers on iOS?

It looks like it has been supported for some time: developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Trailer

A quick of the CFNetwork source suggests that this is supported, with the resulting ‘header’ fields showing up alongside the normal header fields in the

NSHTTPURLResponse

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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

I tried with a NSURLSessionUploadTask (both completion block style and delegate style) with some service that replies trailers, and it does not look like the response header in the completion block parameter include any of the trailer fields. Not sure if I understood you correctly eskimo; am I using the right approach?

Honestly, I’ve never actually tried this, so I’m not 100% clear how the trailers get integrated into a response that you have access to. I was hoping that this would Just Work™, but that doesn’t seem to be the case.

Clearly I need to dig into this some more, and I don’t have time to do that in the context of DevForums. If you open a DTS tech support incident, I’d be happy to take things from there.

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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

mxyan opened a DTS incident about this, which allowed me to dig into it. It turns out that the quick check I mentioned in my 13 Oct post was a little too quick )-: It is true that CFNetwork’s core HTTP engine parses the trailers, but I misread how it surfaces those to higher-level code. The trailers are not merged into the

NSHTTPURLResponse

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"