NSUrlRequest: where an app can find the default headers for HTTP request?

cocoa ios macos core-foundation
zubko picture zubko · Apr 17, 2011 · Viewed 7.4k times · Source

Does anybody know where an iOS app can see the default headers that NSUrlRequest sets for an HTTP request?

Just creating NSUrlRequest with "http://.." NSURL and then asking: [request allHTTPHeaderFields] returns an empty dictionary. But I know that for example "Accept-Encoding" is set to "gzip". So I want to get all that fields and show them in a HTTP request demo.

I've also tried to swizzle [NSMutableURLRequest setValue:forHTTPHeaderField:], but it seems that it is not used by underlying API (NSURLRequest or NSURLConnection) to set those default fields I'm hunting for.

I'm making just a simple iOS demo which shows HTTP request and response information, so it doesn't really matters if it will be a public or private API used for that.

Answer

Black Frog picture Black Frog · Apr 18, 2011

Your app cannot. It's done all down in CFNetwork - Communicating with HTTP Servers. I believe it just adds missing header values not supplied by NSURLRequest.

The defaults are:

  • USER-AGENT "AppName - Eng/1.0 CFNetwork/485.13.9 Darwin/10.7.0"
  • ACCEPT "*/*"
  • ACCEPT-LANGUAGE "en-us"
  • ACCEPT-ENCODING "gzip, deflate"
  • CONNECTION "keep-alive"

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