iOS 使用ASIHTTPRequest 发送Webservice请求

#import <ASIHTTPRequest.h>
#import <ASIFormDataRequest.h>

@interface ViewController ()<ASIHTTPRequestDelegate>
@property (nonatomic, strong) ASIHTTPRequest *request;
@end

- (void)xsNetworkReq
{
NSString *mess = [NSString stringWithFormat:
@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
"<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"
"<soap:Body>\n"
"<selectIsUserOk xmlns=\"http://tempuri.org/\">\n"
"<U_no>%@</U_no>\n"
"<U_pass>%@</U_pass>\n"
"</selectIsUserOk>\n"
"</soap:Body>\n"
"</soap:Envelope>\n", @"", @""
];
//    NSLog(@"%@", mess);
//请求发送到的路径
NSURL *url = [NSURL URLWithString:@""];
NSString *soapActionURL = @"";
self.request = [[ASIHTTPRequest alloc] initWithURL:url];
NSString *msgLength = [NSString stringWithFormat:@"%lu", (unsigned long)[mess length]];
// 以下对请求信息添加属性前四句是必有的，第五句是soap信息。
[self.request addRequestHeader:@"Host" value:[url host]];
[self.request addRequestHeader:@"Content-Length" value:msgLength];
[self.request addRequestHeader:@"Content-Type" value:@"text/xml; charset=utf-8"];
[self.request addRequestHeader:@"SOAPAction" value:[NSString stringWithFormat:@"%@",soapActionURL]];
[self.request setRequestMethod:@"POST"];
//传soap信息
[self.request appendPostData:[mess dataUsingEncoding:NSUTF8StringEncoding]];
[self.request setValidatesSecureCertificate:NO];
[self.request setTimeOutSeconds:60.0];
[self.request setDefaultResponseEncoding:NSUTF8StringEncoding];
self.request.delegate = self;

[self.request startAsynchronous];
}

- (void)requestStarted:(ASIHTTPRequest *)request
{
NSLog(@"开始");
}
- (void)requestFinished:(ASIHTTPRequest *)request
{
NSString *str = [request responseString];
NSLog(@"result-------%@", str);
}
- (void) FaileddidRequestError:(NSError *)error
{
NSLog(@"失败");

}