NSURLConnection times out after reopening app

Question

Created Jun ’15

Replies 4

Boosts 0

Participants 3

Hello,

In my app I use a NSURLConnection to upload some content. Everything works fine except when I reopen the app after like one hour.

On my personal wifi, everything is fine, but when I connect using my operator data plan (I never observed any issue like this on other apps), the first NSURLConnection times out. If I try again, the operation succeeds.

I use a standard NSURLConnection.

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:delegate];

Using

[NSURLConnection sendAsynchronousRequest:request...]

also leads to a timeout.

On another thread on the Apple developer forum somebody suggested to run a packet trace, which I did. The request does not seem to be sent.

I'm a bit out of ideas, do you have one ?

Thanks a lot!

Boost

Answer 1

laurent OP

Jun ’15

I also reproduced the bug while doing this:

reopen the app after a while
make a request on wifi that works
switch to 4G, try to make the same request => fail

I'm really not sure about what's going on here, any workaround?

0

Answer 2

laurent OP

Jun ’15

I'm wondering if it could come from the request itself. Here it is:

NSMutableURLRequest *request = [Services postRequest];
   
// set URL
NSURL *url = [NSURL URLWithString:SERVICE_URL];
[request setURL:url];
   
NSString *boundary = [Services generateBoundary];
   
// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];
   
// post body
NSMutableData *body = [NSMutableData data];
   
// JSON parameters
NSError* JSONSerializationError;
NSData *json = [NSJSONSerialization dataWithJSONObject:defaultParameters options:kNilOptions error:&JSONSerializationError];
   
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", @"json_param"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"%@\r\n", [[NSString alloc] initWithData:json encoding:NSUTF8StringEncoding]] dataUsingEncoding:NSUTF8StringEncoding]];
   

// add image data
if (imageData) {
   
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
   
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", @"uploaded_file"] dataUsingEncoding:NSUTF8StringEncoding]];
   
[body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
   
[body appendData:imageData];
   
[body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}
   
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

0

Answer 3

kthr OP

Jun ’15

There doesn't seem to be anything obviously fishy with that request composition. Can you show us what your asynchronous method call looks like?

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Answer 4

CoachGuitar OP

Sep ’15

Hello Laurent,

it seem our app CoachGuitar has the exact same issue.. we are going crazy about it.

We tried to put KeepAlive= Off server side but with no better results.

Do you still have the issue, or did you found any work around ?

Appreciate any help on this,

Best regards,

Julien

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