CODEWITHSUNDEEP
xcodehttpheaderuser-agentnsurlrequest
Clinton Walsh
Clinton Walsh

Reputation: 167

Getting HTTP headers with xcode

I am trying to get the user agent but when I try and read it, it comes out (null)

NSLog(@"user agent = %@", [request valueForHTTPHeaderField: @"User-Agent"]);

request is an NSURLRequest. So I tried to get the http headers and I don't think there are any. When I use

NSLog(@"http headers = %d", [[req allHTTPHeaderFields] fileSize]);

it prints out zero. req is an NSMutableURLRequest. Does anyone know why this is happening.

This is the method that I am using:

 - (BOOL)webView:(UIWebView )webView2 shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { 
    NSMutableURLRequest *req = (NSMutableURLRequest *)request; 
    NSString *versionString = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString)kCFBundleVersionKey];
NSLog(@"http headers = %@", [request allHTTPHeaderFields]);
NSLog(@"http headers = %d", [[req allHTTPHeaderFields] fileSize]);
[req setValue:[NSString stringWithFormat:@"myApp/%@ %@", versionString, [request valueForHTTPHeaderField:@"User-Agent"]] forHTTPHeaderField:@"User-Agent"];
    NSLog(@"user agent = %@", [request valueForHTTPHeaderField: @"User-Agent"]);}

Upvotes: 1

Views: 8995

Answers (2)

JohnK
JohnK

Reputation: 7337

This worked for me:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSString* secretAgent = [webView stringByEvaluatingJavaScriptFromString:@"navigator.userAgent"];
    NSLog(@"navigator.userAgent = %@", secretAgent);

    NSDictionary* headers = [request allHTTPHeaderFields];
    NSLog(@"headers: %@",headers);

    NSString* ua = [request valueForHTTPHeaderField:@"User-Agent"];
    NSLog(@"User-Agent = %@", ua);
}

I don't know why you're looking at filesize when you can just look at the headers themselves.

Cf. https://stackoverflow.com/a/19184414/1431728

Upvotes: 2

highlycaffeinated
highlycaffeinated

Reputation: 19867

You don't have any headers in your request object because you haven't added any. If you want to specify the User-Agent header, you need to add it yourself, as outlined here.

Upvotes: 0

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