你如何检索来自所有HTTP头NSURLRequest在Objective-C？
Answer 1:
这个属于很容易，但不明显类的iPhone编程问题下。 值得一快速开机的：
为HTTP连接标头包含在NSHTTPURLResponse类。 如果你有一个NSHTTPURLResponse变量，您可以轻松获得头作为一个NSDictionary通过发送allHeaderFields消息。
对于同步请求-不推荐，因为他们阻止-这是很容易来填充NSHTTPURLResponse ：
NSURL *url = [NSURL URLWithString:@"http://www.mobileorchard.com"];
NSURLRequest *request = [NSURLRequest requestWithURL: url];
NSHTTPURLResponse *response;
[NSURLConnection sendSynchronousRequest: request returningResponse: &response error: nil];
if ([response respondsToSelector:@selector(allHeaderFields)]) {
NSDictionary *dictionary = [response allHeaderFields];
NSLog([dictionary description]);
}
随着异步请求，你必须做一些更多的工作。 当回调connection:didReceiveResponse:被调用，它传递了一个NSURLResponse作为第二个参数。 你可以将其转换为NSHTTPURLResponse像这样：
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
if ([response respondsToSelector:@selector(allHeaderFields)]) {
NSDictionary *dictionary = [httpResponse allHeaderFields];
NSLog([dictionary description]);
}
}
Answer 2:
鉴于NSURLConnection是从iOS的9弃用，你可以使用NSURLSession从一个获取MIME类型的信息NSURL或NSURLRequest 。
你问的会话中获取的网址，然后在接收到第一NSURLResponse （包含MIME类型信息）取消，以防止它下载整个URL会议委托回调。
下面是做它的一些裸露的骨头斯威夫特代码：
/// Use an NSURLSession to request MIME type and HTTP header details from URL.
///
/// Results extracted in delegate callback function URLSession(session:task:didCompleteWithError:).
///
func requestMIMETypeAndHeaderTypeDetails() {
let url = NSURL.init(string: "https://google.com/")
let urlRequest = NSURLRequest.init(URL: url!)
let session = NSURLSession.init(configuration: NSURLSessionConfiguration.ephemeralSessionConfiguration(), delegate: self, delegateQueue: NSOperationQueue.mainQueue())
let dataTask = session.dataTaskWithRequest(urlRequest)
dataTask.resume()
}
//MARK: NSURLSessionDelegate methods
func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void) {
// Cancel the rest of the download - we only want the initial response to give us MIME type and header info.
completionHandler(NSURLSessionResponseDisposition.Cancel)
}
func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?)
{
var mimeType: String? = nil
var headers: [NSObject : AnyObject]? = nil
// Ignore NSURLErrorCancelled errors - these are a result of us cancelling the session in
// the delegate method URLSession(session:dataTask:response:completionHandler:).
if (error == nil || error?.code == NSURLErrorCancelled) {
mimeType = task.response?.MIMEType
if let httpStatusCode = (task.response as? NSHTTPURLResponse)?.statusCode {
headers = (task.response as? NSHTTPURLResponse)?.allHeaderFields
if httpStatusCode >= 200 && httpStatusCode < 300 {
// All good
} else {
// You may want to invalidate the mimeType/headers here as an http error
// occurred so the mimeType may actually be for a 404 page or
// other resource, rather than the URL you originally requested!
// mimeType = nil
// headers = nil
}
}
}
NSLog("mimeType = \(mimeType)")
NSLog("headers = \(headers)")
session.invalidateAndCancel()
}
我已经在打包的类似功能URLEnquiry在GitHub上的项目，这使得它更容易一点，使在线查询的MIME类型和HTTP头。 URLEnquiry.swift是可以被丢弃到自己的项目中的权益的文件。
Answer 3:
YourViewController.h
@interface YourViewController : UIViewController <UIWebViewDelegate>
@property (weak, nonatomic) IBOutlet UIWebView *yourWebView;
@end
YourViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
//Set the UIWebView delegate to your view controller
self.yourWebView.delegate = self;
//Request your URL
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://website.com/your-page.php"]];
[self.legalWebView loadRequest:request];
}
//Implement the following method
- (void)webViewDidFinishLoad:(UIWebView *)webView{
NSLog(@"%@",[webView.request allHTTPHeaderFields]);
}
Answer 4:
使用Alamofire效率斯威夫特版本。 这是对我工作：
Alamofire.request(YOUR_URL).responseJSON {(data) in
if let val = data.response?.allHeaderFields as? [String: Any] {
print("\(val)")
}
}
文章来源: How to get HTTP headers
