use okhttp and use following snippet (taken from recipes) adjust the header values according to what your server expects. private static final String IMGUR_CLIENT_ID = “…”; private static final MediaType MEDIA_TYPE_PNG = MediaType.parse(“image/png”); private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { // Use the imgur image upload API as documented … Read more
You can get a FileNotFoundException from HttpUrlConnection (and OkHttpClient) if your server returns >= HTTPStatus.BAD_REQUEST (400). You should check the status code first to check what stream you need to read. int status = connection.getResponseCode(); if(status >= HttpStatus.SC_BAD_REQUEST) in = connection.getErrorStream(); else in = connection.getInputStream(); HttpStatus deprecated. Latest syntax seems to be: InputStream inputStream; int … Read more
If you really want to use the HttpURLConnection you can use the setRequestProperty method like: myHttpURLConnection.setRequestProperty(“Content-Type”, “text/plain; charset=utf-8”); myHttpURLConnection.setRequestProperty(“Expect”, “100-continue”); However, if I were you I’d look into using the Apache HTTP libraries. They’re a little higher-level and easier to use. With them you would do it with something like: HttpGet get = new HttpGet(“http://192.168.1.36/”); … Read more
According to Sun’s HttpURLConnection source there is some logging support via JUL. Setup (adjust path as required): -Djava.util.logging.config.file=/full/path/to/logging.properties logging.properties: handlers= java.util.logging.ConsoleHandler java.util.logging.ConsoleHandler.level = FINEST sun.net.www.protocol.http.HttpURLConnection.level=ALL This will log to the console, adjust as required to e.g. log to a file. Example output: 2010-08-07 00:00:31 sun.net.www.protocol.http.HttpURLConnection writeRequests FIN: sun.net.www.MessageHeader@16caf435 pairs: {GET /howto.html HTTP/1.1: null}{User-Agent: Java/1.6.0_20}{Host: www.rgagnon.com}{Accept: … Read more
“Unexpected end of file” implies that the remote server accepted and closed the connection without sending a response. It’s possible that the remote system is too busy to handle the request, or that there’s a network bug that randomly drops connections. It’s also possible there is a bug in the server: something in the request … Read more
If you want to send String only try this way: String str = “some string goes here”; byte[] outputInBytes = str.getBytes(“UTF-8”); OutputStream os = conn.getOutputStream(); os.write( outputInBytes ); os.close(); But if you want to send as Json change Content type to: conn.setRequestProperty(“Content-Type”,”application/json”); and now our str we can write: String str = “{\”x\”: \”val1\”,\”y\”:\”val2\”}”; Hope … Read more
It’s not foolproof but it’s probably the easiest and doesn’t rely on any external data. Like all decent formats, GZip too begins with a magic number which can be quickly checked without reading the entire stream. public static InputStream decompressStream(InputStream input) { PushbackInputStream pb = new PushbackInputStream( input, 2 ); //we need a pushbackstream to … Read more
You can get raw data using below method. BTW, this pattern is for Java 6. If you are using Java 7 or newer, please consider try-with-resources pattern. public String getJSON(String url, int timeout) { HttpURLConnection c = null; try { URL u = new URL(url); c = (HttpURLConnection) u.openConnection(); c.setRequestMethod(“GET”); c.setRequestProperty(“Content-length”, “0”); c.setUseCaches(false); c.setAllowUserInteraction(false); c.setConnectTimeout(timeout); … Read more
For OkHttp 3 the default value for OkHttp is 10 seconds. You can increase the timeout to 30 seconds. OkHttpClient client = new OkHttpClient(); client.setConnectTimeout(30, TimeUnit.SECONDS); // connect timeout client.setReadTimeout(30, TimeUnit.SECONDS); // socket timeout
I don’t know if it’s the only problem, but you’ve got a classic Java glitch in there: You’re not counting on the fact that read() is always allowed to return fewer bytes than you ask for. Thus, your read could get less than 1024 bytes but your write always writes out exactly 1024 bytes possibly … Read more