NSHTTPURLResponse's initWithURL method crashes if we set header "Content-Length"

Question

Here's some code, where we set up an NSHTTPURLResponse object:

NSString * data = @"response successful";
NSUInteger length = [data length];
NSDictionary * headersDict = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithUnsignedInt:length], @"Content-Length", nil];

NSHTTPURLResponse * response = [[NSHTTPURLResponse alloc] initWithURL:[request URL] statusCode:200 HTTPVersion:@"1.1" headerFields:headersDict];

The following code will crash at the last line if we put headersDict as parameter.

error: testReportAppOpenToAdMobWithAppstoreId (AdTrackerTests) failed: -[__NSCFNumber length]: unrecognized selector sent to instance 0xf653f40

I don't know why it crashes. Debugging shows that headersDict is good, I suspect a bug on Apple's part.

Any ideas?

score 5 · Accepted Answer · answered Jul 04 '12 at 07:38

5

NSHTTPURLResponse is probably expecting an NSString, not an NSNumber. Try converting the length value to an NSString.

answered Jul 04 '12 at 07:38

ThomasW

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2

every key and value in `NSHTTPURLResponse` header is expecting an `NSString`... Oh My 2 hours.... – chao787 Jul 09 '14 at 15:50
Hello, how to fix it? – Jerome Jul 31 '18 at 02:28
1

@Jerome Use `[NSString stringWithFormat:@"%lu", (unsigned long) length]` from https://stackoverflow.com/a/20434633/211292 – ThomasW Aug 06 '18 at 02:24

NSHTTPURLResponse's initWithURL method crashes if we set header "Content-Length"

1 Answers1