将自定义标头添加到WebView资源请求-Android

Question

我需要向来自WebView的每个请求添加自定义标头。我知道loadURL具有的参数extraHeaders，但这些参数仅应用于初始请求。所有后续请求均不包含标头。我已经看过所有重写WebViewClient，但是没有任何内容允许将标头添加到资源请求- onLoadResource(WebView view, String url)。任何帮助都会很棒。谢谢，雷

Answer 1

尝试

loadUrl(String url, Map<String, String> extraHeaders)

要将标头添加到资源加载请求中，请自定义WebViewClient并重写：

API 24+:

WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request)

or

WebResourceResponse shouldInterceptRequest(WebView view, String url)

Answer 2

您将需要使用WebViewClient.shouldInterceptRequest拦截每个请求

每次拦截时，您都需要获取url，自行提出此请求，然后返回内容流：

WebViewClient wvc = new WebViewClient() {

    @Override

    public WebResourceResponse shouldInterceptRequest(WebView view, String url) {

        try {

            DefaultHttpClient client = new DefaultHttpClient();

            HttpGet httpGet = new HttpGet(url);

            httpGet.setHeader("MY-CUSTOM-HEADER", "header value");

            httpGet.setHeader(HttpHeaders.USER_AGENT, "custom user-agent");

            HttpResponse httpReponse = client.execute(httpGet);

            Header contentType = httpReponse.getEntity().getContentType();

            Header encoding = httpReponse.getEntity().getContentEncoding();

            InputStream responseInputStream = httpReponse.getEntity().getContent();

            String contentTypeValue = null;

            String encodingValue = null;

            if (contentType != null) {

                contentTypeValue = contentType.getValue();

            }

            if (encoding != null) {

                encodingValue = encoding.getValue();

            }

            return new WebResourceResponse(contentTypeValue, encodingValue, responseInputStream);

        } catch (ClientProtocolException e) {

            //return null to tell WebView we failed to fetch it WebView should try again.

            return null;

        } catch (IOException e) {

             //return null to tell WebView we failed to fetch it WebView should try again.

            return null;

        }

    }

}

Webview wv = new WebView(this);

wv.setWebViewClient(wvc);

如果您的最低API目标是21级，则可以使用新的shouldInterceptRequest，它为您提供其他请求信息（例如标头），而不仅仅是URL。