Can't Set Headers on My Wkwebview Post Request

Can't set headers on my WKWebView POST request

I had the same problem with WKWebView, that I decided to use instead of UIWebView to avoid the pickers crash in iOS 8. There are two ways that I can think of:

Use NSURLConnection to make the request and then fill the WKWebView with it's response data. You can find an example here:
https://stackoverflow.com/a/10077796/4116680 (You only need connection:didReceiveData: and connectionDidFinishLoading: from the delegate if you don't use a self signed SSL certificate)
Use a JavaScript to make the POST request. Here is an example:

Create file eg. "POSTRequestJS.html":

<html>
    <head>
        <script>
            //POST request example:
            //post('URL', {key: 'value'});
            function post(path, params) {
                var method = "post";
                var form = document.createElement("form");
                form.setAttribute("method", method);
                form.setAttribute("action", path);

                for(var key in params) {
                    if(params.hasOwnProperty(key)) {
                        var hiddenField = document.createElement("input");
                        hiddenField.setAttribute("type", "hidden");
                        hiddenField.setAttribute("name", key);
                        hiddenField.setAttribute("value", params[key]);

                        form.appendChild(hiddenField);
                    }
                }

                document.body.appendChild(form);
                form.submit();
            }
        </script>
    </head>
    <body>
    </body>
</html>

And in your code after where you want to load your request:

NSString *path = [[NSBundle mainBundle] pathForResource:@"POSTRequestJS" ofType:@"html"];
NSString *html = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
WKWebView.navigationDelegate = self;
[WKWebView loadHTMLString:html baseURL:[[NSBundle mainBundle] bundleURL]];

Add method:

- (void)makePostRequest
{
    NSString *postData = [NSString stringWithFormat: @"email=%@&password=%@", email, password];
    NSString *urlString = @"http://materik.me/endpoint";
    NSString *jscript = [NSString stringWithFormat:@"post('%@', {%@});", urlString, postData];

    DLog(@"Javascript: %@", jscript);

    [WKWebView evaluateJavaScript:jscript completionHandler:nil];

    didMakePostRequest = YES;
}

And last add the WKNavigationDelegate:

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
{
    if (!didMakePostRequest) {
        [self makePostRequest];
    }
}

Add request header to ALL outgoing requests within a WKWebView

It is impossible with current API - there is no point where you can handle all requests that made by WKWebView. You can use UIWebView + custom url protocol (WKWebView doesn't support it) and add your header to all requests for certain server as an alternative.

How to get headers from WKWbView finish loads

You need to set your view controller as the WKWebView Navigation Delegate WKNavigationDelegate and implement its decidePolicyFor method:

optional func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void)

Try like this:

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
    let allHTTPHeaderFields = navigationAction.request.allHTTPHeaderFields ?? [:]
    for (key, value) in allHTTPHeaderFields {
        print("key:", key, "value:", value)
    }
    
    if navigationAction.navigationType == .linkActivated  {
        if let url = navigationAction.request.url,
            let host = url.host, !host.hasPrefix("www.google.com"),
            UIApplication.shared.canOpenURL(url) {
            UIApplication.shared.open(url)
            print(url)
            print("Redirected to browser. No need to open it locally")
            decisionHandler(.cancel)
        } else {
            print("Open it locally")
            decisionHandler(.allow)
        }
    } else {
        print("not a user click")
        decisionHandler(.allow)
    }
}

How to add customize HTTP headers in UIWebView request, my UIWebView is based on Cordova project?

You have two options either create a NSMutableUrlRequest at the start and load that with webView loadReqest or take over the complete URL loading of your app with NSURLProtocol.

The most easiest way is the first choice as its only one extra lines of code:

[webView loadRequest:mRequest];

The second choice uses NSURLProtocol to take over URL loading of your app. this involves registering your own solution using creating a concrete class. the main method to override is canonicalRequestForRequest.

I suggest you take a look at these two tutorials NSNipster and raywenderlich for guides.

Can't Set Headers on My Wkwebview Post Request