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

Question

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

Just creating NSUrlRequest with

Answer 1

hmm... maybe you might want to try within

- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse

method in your custom nsurlconnection class. although the documentation mentions something about redirects, this is certainly worth looking into.

Answer 2

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"

Answer 3

That may be an overkill, but based on Matt Gallagher's blog post I've created even more simpler local HTTP listener and sent a separate [mutableCopy]ed request to it to be able to read and output all HTTP headers that this request has.

Better solution must be to setup a local HTTP request catcher, it must look nicer I think, but for the scope of simple demo just to show all sent/received headers this solution is OK.