Send Post Request Along with Httpheaders on Android

how can i add a custom header to post request on webview

I ran into needing to implement such a feature myself so I'm posting a code snippet for anyone running into the same issue in the future.
I'd definitely recommend using OkHttp but the principle (make a request and load the html into the browser in the success callback) should be the same with any other network client.

protected void postURL(final String url, String postData) {
    Request request = new Request.Builder()
            .url(url)
            .addHeader("Cache-Control", "max-age=0")
            .addHeader("Origin", "null") //Optional
            .addHeader("Upgrade-Insecure-Requests", "1")
            .addHeader("User-Agent", webView.getSettings().getUserAgentString())
            .addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8")
            .addHeader("Accept-Language", Locale.getDefault().getLanguage())
            .addHeader("Cookie", CookieManager.getInstance().getCookie(url))
            .addHeader("X-Requested-With", BuildConfig.APPLICATION_ID)
            .post(RequestBody.create(MediaType.parse("application/x-www-form-urlencoded"), postData))
            .build();

    new OkHttpClient().newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            Timber.e(e.getMessage());
        }

        @Override
        public void onResponse(Call call, final Response response) throws IOException {
            final String htmlString = response.body().string();

            webView.post(new Runnable() {
                @Override
                public void run() {
                    webView.clearCache(true);
                    webView.loadDataWithBaseURL(url, htmlString, "text/html", "utf-8", null);
                }
            });
        }
    });
}

Note that most of those headers are not required but can be used as a guideline to reconstruct an original request issued by the webview itself

Send authorization header with every request in webview using okhttp in android

Finally this will rectify the html rendering issue (Pardon me, I didn't notice this earlier).

change content-type in

return new WebResourceResponse(response.header("content-type", response.body().contentType().type()), // You can set something other as default content-type
                        response.header("content-encoding", "utf-8"),  // Again, you can set another encoding as default
                        response.body().byteStream());

to text/html , so the new code is

return new WebResourceResponse(response.header("text/html", response.body().contentType().type()), // You can set something other as default content-type
                    response.header("content-encoding", "utf-8"),  // Again, you can set another encoding as default
                    response.body().byteStream());

If my solution needs any modifications, feel free to edit. Always accept better solutions. Happy coding...And Thanks everyone #SO ready to help.

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