NSURL *url = [NSURL URLWithString:@"你要请求的URL"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"PUT";
request.allHTTPHeaderFields = @{@"":@""}//此处为请求头，类型为字典
NSString *msg = @"请求参数";
NSData *data = [msg dataUsingEncoding:NSUTF8StringEncoding];
request.HTTPBody = data;
[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"%@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
}] resume];
