android webview 响应头,访问WebView中的http响应头？

@TargetApi(Build.VERSION_CODES.LOLLIPOP)

@Override

public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {

Log.i(TAG,"shouldInterceptRequest path:"+request.getUrl().getPath());

WebResourceResponse returnResponse = null;

if (request.getUrl().getPath().startsWith("/cart")) { // only interested in /cart requests

returnResponse = super.shouldInterceptRequest(view, request);

Log.i(TAG,"cart AJAX call - doing okRequest");

Request okRequest = new Request.Builder()

.url(request.getUrl().toString())

.post(null)

.build();

try {

Response okResponse = app.getOkHttpClient().newCall(okRequest).execute();

if (okResponse!=null) {

int statusCode = okResponse.code();

String encoding = "UTF-8";

String mimeType = "application/json";

String reasonPhrase = "OK";

Map responseHeaders = new HashMap();

if (okResponse.headers()!=null) {

if (okResponse.headers().size()>0) {

for (int i = 0; i < okResponse.headers().size(); i++) {

String key = okResponse.headers().name(i);

String value = okResponse.headers().value(i);

responseHeaders.put(key, value);

if (key.toLowerCase().contains("x-cart-itemcount")) {

Log.i(TAG,"setting cart item count");

app.setCartItemsCount(Integer.parseInt(value));

}

}

}

}

InputStream data = new ByteArrayInputStream(okResponse.body().string().getBytes(StandardCharsets.UTF_8));

Log.i(TAG, "okResponse code:" + okResponse.code());

returnResponse = new WebResourceResponse(mimeType,encoding,statusCode,reasonPhrase,responseHeaders,data);

} else {

Log.w(TAG,"okResponse fail");

}

} catch (IOException e) {

e.printStackTrace();

}

}

return returnResponse;

}