NSMutableURLRequest timeout interval not taken into consideration for POST requests

问题

I have the following problem. On a NSMutableURLRequest using the HTTP method POST the timeout interval set for the connection is ignored. If the internet connection has a problem (wrong proxy, bad dns) the url request fails after about 2-4 minutes but not with NSLocalizedDescription = \"timed out\";

NSUnderlyingError = Error Domain=kCFErrorDomainCFNetwork Code=-1001 UserInfo=0x139580 \"The request timed out.

If the http method used is GET it works fine. The connection is async over https.

    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    

    [request setTimeoutInterval:10];

    //Set the request method to post
    [request setHTTPMethod:@\"POST\"];

    if (body != nil) {
        [request setHTTPBody:body];
    }

    // Add general parameters to the request
    if (authorization){
        [request addValue: authorization forHTTPHeaderField:@\"Authorization\"];
    }
    [request addValue: WS_HOST forHTTPHeaderField:@\"Host\"];
    [request addValue:@\"text/xml\" forHTTPHeaderField:@\"Content-Type\"];

    [[NSURLCache sharedURLCache] setDiskCapacity:0];

    [self addToQueueRequest:request withDelegate:delegate];

\'

回答1:

According to a post on the Apple developer forum, the minimum timeout interval for POST is 240 seconds. Any timeout interval shorter than that is ignored.

If you require a shorter timeout interval, use an async request along with a timer and call cancel on the NSURLConnection as needed.

link to thread: here

回答2:

iOS 6 has fixed this issue.

NSMutableURLRequest *request = [NSMutableURLRequest 
                                requestWithURL:[NSURL URLWithString:url] 
cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20];

[request setHTTPMethod:method];
[request setHTTPBody:requestBody];
NSLog(@"%f", [request timeoutInterval]); 
//20.0 in iOS 6
//240.0 in iOS 4.3, 5.0, 5.1

回答3:

Fixed with Clay Chambers's suggestion: with a custom timer Added a timer in a subclass of NSURLConnection

if (needsSeparateTimeout){

    SEL sel = @selector(customCancel);

    NSMethodSignature* sig = [self methodSignatureForSelector:sel];

    NSInvocation* invocation = [NSInvocation invocationWithMethodSignature:sig];

    [invocation setTarget:self];

    [invocation setSelector:sel];

    NSTimer *timer = [NSTimer timerWithTimeInterval:WS_REQUEST_TIMEOUT_INTERVAL invocation:invocation repeats:NO];

    [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

}

In the custom cancel method the connection is cancelled

[super cancel];     

回答4:

It looks like problem described here is still facing iOS 7.1 (or reappeared). Fortunately it looks like setting timeoutIntervalForResource property on the configuration on the NSURLSession can fix this.

EDIT

According to @XiOS observations this works for timeouts shorter than (around) 2 minutes.

回答5:

If you mean how to handle timeout error , I think no one answer this question yet

Let me write pice of my code to Explain that point

// replace "arg" with your argument you want send to your site 
 NSString * param = [NSString stringWithFormat:@"arg"];

    NSData *Postdata = [param dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%lu",(unsigned long)[Postdata length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc]init];
// replace "yoursite" with url of site you want post to 
    [request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"http//yoursite"]]];
// set what ever time you want in seconds 120 mean 2 min , 240 mean 4 min 
    [request setTimeoutInterval:120];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded"  forHTTPHeaderField:@"Current-Type"];

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

// if request time out without response from server error will occurred 

-(void) connection:(NSURLConnection * ) connection didFailWithError:(NSError *)error {    
    if (error.code == NSURLErrorTimedOut) 
        // handle error as you want 
        NSLog(@"Request time out , Please try again later");
}

I hope this help with any one ask how to handle timeout error

来源：https://stackoverflow.com/questions/1466389/nsmutableurlrequest-timeout-interval-not-taken-into-consideration-for-post-reque