为所有齐射请求设置自定义标头

Question

重写 getHeaders() 可以在必要时向请求添加自定义标头。但是如果总是需要设置 X 标头怎么办？例如静态身份验证令牌。

JsonObjectRequest req = new JsonObjectRequest(URL, new JSONObject(params),
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    setFollowButton(item);
                }
            }, null){
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<String, String>();
            headers.put("Authorization", "Token XXXXXXXXXXXX");
            return headers;
        }
};

Application.getInstance().addToRequestQueue(req);

是否可以将标头添加到发送到 addToRequestQueue 方法的请求中，而不是每次写入请求时覆盖它？

Answer 1

我相信最好的方法是扩展HttpStack您选择使用的子类，然后拦截该performRequest()方法，将全局标头放入其中。

public class MyHurlStack extends HurlStack {
    @Override
    public HttpResponse performRequest(
            Request<?> request, Map<String, String> additionalHeaders)
            throws IOException, AuthFailureError {

        Map<String, String> headers = request.getHeaders();
        // put your global headers
        headers.put("Via", "netroid");
        headers.put("Accept-Charset", "UTF-8");
        headers.put("Origin", "http://netroid.cn/");

        return super.performRequest(request, additionalHeaders);
    }
}

public class MyHttpClientStack extends HttpClientStack {
    public MyHttpClientStack(HttpClient client) {
        super(client);
    }

    @Override
    protected void onPrepareRequest(HttpUriRequest request) throws IOException {
        // put your global headers
        request.setHeader("Via", "netroid");
        request.setHeader("Accept-Charset", "UTF-8");
        request.setHeader("Origin", "http://netroid.cn/");
        super.onPrepareRequest(request);
    }
}

初始化时RequestQueue，使用自定义的HttpStack代替。

if (stack == null) {
    if (Build.VERSION.SDK_INT >= 9) {
        stack = new HurlStack();
    } else {
        stack = new MyHttpClientStack(AndroidHttpClient.newInstance(userAgent));
    }
}

Network network = new BasicNetwork(stack);