httpurlconnection

I am simply making a GET request to a Rest API using HttpURLConnection . I need to add some custom headers but I am getting null while trying to retrieve their values. Code: URL url; try { url = new URL("http://www.example.com/rest/"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); // Set Headers conn.setRequestProperty("CustomHeader", "someValue"); conn.setRequestProperty("accept", "application/json"); // Output is null here <-------- System.out.println(conn.getHeaderField("CustomHeader")); // Request not successful if (conn.getResponseCode() != HttpURLConnection.HTTP_OK)

I can succesfully connect, send and receive data by using httpurlconnection. But it takes very long time to load all the data on my phone (Samsung s4, 4.2) and on android 4.2 emulator. But it takes almost 1-2 seconds (which is very fast) to load pics on Android 2.3.x emulator. Faster than my galaxy s4 on http connection. I'm using AsyncTask and my code works fine on both. It is just slow on android 4.2s. I tried removing chunkedStreaming, keep alive, changing timeout values etc. but still no success Here is my code HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

I'm new in Android (and in Java too), so sorry if my problem is a basic proposition! I have to write an Android app, whitch signs into an aspx webpage in the background, get some data from it, and after that logs out form the webpage. (and do that all programmatically) Basicly, the procedure likes getting email-list from Gmail: 1. go to 'https://mail.google.com', and signs in 2. click to the "Contacts" (== go to "https://mail.google.com/mail/?shva=1&zx=dzi4xmuko5nz#contacts") 3. fetch the page using HttpsURLConnection (or something like this), and get emails in an (e.g. Map or String) object 4

I can not see what is wrong with this code: JSONObject msg; //passed in as a parameter to this method HttpURLConnection httpCon = (HttpURLConnection) url.openConnection(); httpCon.setDoOutput(true); httpCon.setDoInput(true); httpCon.setUseCaches(false); httpCon.setRequestProperty( "Content-Type", "application/json" ); httpCon.setRequestProperty("Accept", "application/json"); httpCon.setRequestMethod("POST"); OutputStream os = httpCon.getOutputStream(); OutputStreamWriter osw = new OutputStreamWriter(os, "UTF-8"); msg.write(osw); osw.flush(); osw.close(); os.close(); //probably overkill On the

请求响应流程 设置连接参数的方法 setAllowUserInteraction setDoInput setDoOutput setIfModifiedSince setUseCaches setDefaultAllowUserInteraction setDefaultUseCaches 设置请求头或响应头 HTTP请求允许一个key带多个用逗号分开的values，但是HttpURLConnection只提供了单个操作的方法： setRequestProperty(key,value) addRequestProperty(key,value) setRequestProperty和addRequestProperty的区别就是，setRequestProperty会覆盖已经存在的key的所有values，有清零重新赋值的作用。而addRequestProperty则是在原来key的基础上继续添加其他value。 发送URL请求 建立实际连接之后，就是发送请求，把请求参数传到服务器，这就需要使用outputStream把请求参数传给服务器： getOutputStream 获取响应 请求发送成功之后，即可获取响应的状态码，如果成功既可以读取响应中的数据，获取这些数据的方法包括： getContent getHeaderField getInputStream 对于大部分请求来说

I'm trying to get the favicon of the url the user enters, for example _url = "google.com"; I use HttpUrlConnection to get the Bitmap of the favicon from the /favicon.ico extension from the host url. String faviconString = Uri.parse(_url).getHost() + "/favicon.ico"; URL faviconUrl = null; Bitmap favicon = null; try { faviconString = "http://" + faviconString; faviconUrl = new URL(faviconString); HttpURLConnection connection = (HttpURLConnection) faviconUrl.openConnection(); connection.setDoInput(true); connection.connect(); favicon = BitmapFactory.decodeStream(connection.getInputStream()); }

I am using HttpUrlConnection to make network requests from my android application. Everything works fine except one thing, 401. Whenever the server returns response with status code 401, my app throws IOException with a message stating, "no authentication challenge found" . After googling it, I haven't found a single solution, but only workaround (handling it using try/catch, assuming its a 401 response). here is the code snippet: public Bundle request(String action, Bundle params, String cookie) throws FileNotFoundException, MalformedURLException, SocketTimeoutException, IOException {

I am trying to save a file from URL using outputstream. The URL is secure by https. So I got some error when I try to get the file as the following javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at sun.security.ssl.Alerts.getSSLException(Unknown Source) at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source) at sun.security.ssl.Handshaker.fatalSE(Unknown Source) at sun.security.ssl.Handshaker.fatalSE(Unknown Source)

In my Application class, I do the following: public class MyApplication extends Application { private static HttpURLConnection conn = null; public static CookieStore cookieStore; public static HttpContext localContext; public static DefaultHttpClient client = new DefaultHttpClient(); @Override public void onCreate() { // TODO Auto-generated method stub super.onCreate(); CookieSyncManager.createInstance(this); cookieStore = new BasicCookieStore(); localContext = new BasicHttpContext(); localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore); } ... } And I have a connection in