ios-to determine if URLs are available, and to determine if URLs are correct

Source: Internet
Author: User

Idea: Pass in a request URL, make a network request, if return failure information indicates this URL is not available
1. First, the first step is to determine whether the incoming string conforms to the syntax rules of the HTTP path, that is, "https://" or "http://", from the encapsulated function, passed in can be judged

- (Nsurl*) Smarturlforstring: (NSString*) str{Nsurl* result;NSString* TRIMMEDSTR;NsrangeSchememarkerrange;NSString* Scheme; ASSERT (str! =Nil); result =Nil; TRIMMEDSTR = [str stringbytrimmingcharactersinset:[nscharacterset whitespacecharacterset];if((Trimmedstr! =Nil) && (trimmedstr. Length!=0) {Schememarkerrange = [trimmedstr rangeofstring:@"://"];if(Schememarkerrange. location==Nsnotfound) {result = [Nsurlurlwithstring:[NSStringstringwithformat:@"http://%@", Trimmedstr]]; }Else{scheme = [Trimmedstr substringwithrange:nsmakerange (0, Schememarkerrange. location)]; ASSERT (Scheme! =Nil);if([Scheme compare:@"http"Options:nscaseinsensitivesearch] = = Nsorderedsame) | | ([Scheme compare:@"https"Options:nscaseinsensitivesearch] = = Nsorderedsame)) {result = [NsurlURLWITHSTRING:TRIMMEDSTR]; }Else{//It looks like this is some unsupported URL scheme.}        }    }returnResult;}

The second step is to determine if the path can be successfully requested, make an HTTP request directly, observe the return result

//Judgment-(void) Validateurl: (Nsurl*) Candidate {nsmutableurlrequest *request = [Nsmutableurlrequest requestwithurl:candidate]; [Request sethttpmethod:@"HEAD"]; Nsurlsession *session = [Nsurlsession sessionwithconfiguration:[nsurlsessionconfiguration    Defaultsessionconfiguration]]; Nsurlsessiondatatask *task = [Session datataskwithrequest:request completionhandler:^ (NSData * _Nullable data, Nsurlresponse * _nullable Response,Nserror* _nullable error) {NSLog(@"Error%@", error);if(Error) {NSLog(@"Not Available"); }Else{NSLog(@"Available");    }    }]; [Task resume];}

ios-to determine if URLs are available, and to determine if URLs are correct

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.