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Type:
Bug
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Status: Resolved
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Priority:
Medium
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Resolution: Done
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Component/s: Foundation
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Labels:None
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Environment:
Xcode Version 8.0 beta 6 (8S201h)
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Radar URL:
HTTPURLResponse normalizes header names following RFC 2616 as described in https://developer.apple.com/reference/foundation/httpurlresponse/1417930-allheaderfields
Access to these header values is case-insensitive as described in the documentation. This is broken in the latest Xcode8 beta6. The access is now case-sensitive.
Additionally the "ETag" header name is normalized to "Etag" instead of "ETag" as described in RFC 2616
This works correctly on Xcode8 beta4
Steps to Reproduce:
Run following Swift code:
let url = URL(string: "http://www.apple.com")! let headers = [ "ETag" : "123456", "content-type": "application/json", ] let urlResponse = HTTPURLResponse(url: url, statusCode: 200, httpVersion: nil, headerFields: headers) print("ETag: \(urlResponse?.allHeaderFields["ETag"])") print("Etag: \(urlResponse?.allHeaderFields["Etag"])") print("ETAG: \(urlResponse?.allHeaderFields["ETAG"])") print("etag: \(urlResponse?.allHeaderFields["etag"])") print("content-type: \(urlResponse?.allHeaderFields["content-type"])") print("Content-Type: \(urlResponse?.allHeaderFields["Content-Type"])") print("CONTENT-TYPE: \(urlResponse?.allHeaderFields["CONTENT-TYPE"])")
Same code in Objective-C works as expected:
NSURL *url = [[NSURL alloc] initWithString:@"http://www.apple.com"]; NSDictionary *headers = @{ @"ETag": @"123456", @"content-type": @"application/json", }; NSURL *url = [[NSURL alloc] initWithString:@"http://www.apple.com"]; NSDictionary *headers = @{ @"ETag": @"123456", @"content-type": @"application/json", }; NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:url statusCode:200 HTTPVersion:nil headerFields:headers]; NSLog(@"Headers: %@", response.allHeaderFields); NSLog(@"ETag: %@", response.allHeaderFields[@"ETag"]); NSLog(@"Etag: %@", response.allHeaderFields[@"Etag"]); NSLog(@"etag: %@", response.allHeaderFields[@"etag"]); NSLog(@"ETAG: %@", response.allHeaderFields[@"ETAG"]); NSLog(@"content-type: %@", response.allHeaderFields[@"content-type"]); NSLog(@"Content-Type: %@", response.allHeaderFields[@"Content-Type"]); NSLog(@"CONTENT-TYPE: %@", response.allHeaderFields[@"CONTENT-TYPE"]);
Expected Results:
Headers: Optional([AnyHashable("Content-Type"): application/json, AnyHashable("Etag"): 123456]) ETag: Optional(123456) Etag: Optional(123456) ETAG: Optional(123456) etag: Optional(123456) content-type: Optional(application/json) Content-Type: Optional(application/json) CONTENT-TYPE: Optional(application/json)
Actual Results:
Headers: Optional([AnyHashable("Content-Type"): application/json, AnyHashable("Etag"): 123456]) ETag: nil Etag: Optional(123456) ETAG: nil etag: nil content-type: nil Content-Type: Optional(application/json) CONTENT-TYPE: nil
Version:
Version 8.0 beta 6 (8S201h)