I have this situation: there is a Jersey rest web service working via HTTPS. I'm working on an Android code that will POST Json to that service and read response. I managed to connect, from API log i can see that call has been received and no errors are displayed, i also get data in the "InputStream" of the connection, but data is encrypted! Even when i try using plain HTTP connection and run web service in HTTP mode result is the same.
What confuses me is that equal cURL request produces proper output without any issues... Where am i wrong? This is the code i'm using:
URL url = new URL("https://myServer:8780/api/<apicall>");
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
// Create the SSL connection
SSLContext sc;
sc = SSLContext.getInstance("TLS");
sc.init(null, null, new java.security.SecureRandom());
conn.setSSLSocketFactory(sc.getSocketFactory());
// set Timeout and method
conn.setReadTimeout(7000);
conn.setConnectTimeout(7000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setRequestProperty("Accept-Encoding", "gzip");
conn.setRequestProperty("Accept", "application/json");
// Add any data you wish to post here
String json = "{\"test\":\"hello\"}";
byte[] bytes = json.getBytes("UTF-8");
OutputStream out = conn.getOutputStream();
out.write(bytes);
out.flush();
out.close();
String result = new String();
InputStream is = null;
/*if ("gzip".equals(conn.getContentEncoding()))
is = new GZIPInputStream(conn.getInputStream()); THIS WOULD FAIL WITH ERROR MESSAGE THAT CONTENT IS NOT IN GZIP FORMAT!
else*/
is = conn.getInputStream();
BufferedReader in = new BufferedReader(new InputStreamReader(is));
String inputLine;
while ((inputLine = in.readLine()) != null) {
result += inputLine;
}
In the same time, this cURL call (i'm using Linux) works perfectly and returns expected JSON response from the server:
curl -H 'Accept-Encoding: gzip' -X POST https://myServer:8780/api/<apicall> -d '{"test":"hello"}'
EDIT Issue was caused by my server using both "Content-encoding: gzip" and "Transfer-encoding: gzip". When i removed "Transfer-Encoding" issue was solved!
Related
Currently, I am working on creating a Android app to read and create google sites content. It seems like the java api doesn't work for Android, so I use google protocol
https://developers.google.com/google-apps/sites/docs/1.0/developers_guide_protocol#ContentFeedPOST.
I can get all the content on google site by this GET request
https://sites.google.com/feeds/site/domainName.
But I have no idea how to send a POST request to create a content beside on the google api guide.
Hope anyone could help me with this. All I need is how to send the request in curl.
Thanks!
you can try curl command like this:
curl -H "Content-Type: your-content-type" -X POST -d 'your-data' https://localhost:8080/api/login
And to post data using HttpUrlConnection class use following:
HttpURLConnection connection = null;
try {
//Create connection
url = new URL(targetURL);
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type",
"your-content-type");//set required content type
connection.setRequestProperty("Content-Length", "" +
data.getBytes().length);//set Content-Length header using your data length in bytes
connection.setRequestProperty("Content-Language", "en-US");
connection.setDoInput(true);
connection.setDoOutput(true);
//Send request
DataOutputStream wr = new DataOutputStream (
connection.getOutputStream ());
wr.writeBytes (data);//write data to o/p stream
wr.flush ();
wr.close ();
//Get Response
InputStream is = connection.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line;
StringBuffer response = new StringBuffer();
while((line = rd.readLine()) != null) {
response.append(line);
response.append('\r');
}
rd.close();
return response.toString();
} catch (Exception e) {
} finally {
if(connection != null) {
connection.disconnect();
}
}
I'm trying to establish a persistent HTTP connection to an API endpoint that publishes chunked JSON responses as new events occur. I would like to provide a callback that is called each time the server sends a new chunk of data, and keep the connection open indefinitely. As far as I can tell, neither HttpClient nor HttpUrlConnection provide this functionality.
Is there a way to accomplish this without using a TCP socket?
One solution would be to use a delimeter such as \n\n to separate each json event. You could remove blank lines from original json before sending. Calling setChunkedStreamingMode(0) allows you to read content as it comes in (rather than after the entire request has been buffered). Then you can simply go through each line, storing them, until a blank line is reached, then parse the stored lines as JSON.
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setChunkedStreamingMode(0);
conn.connect();
InputStream is = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
StringBuffer sBuffer = new StringBuffer();
String line;
while ((line = reader.readLine()) != null) {
if (line.length() == 0) {
processJsonEvent(sBuffer.toString());
sBuffer.delete(0, sBuffer.length());
} else {
sBuffer.append(line);
sBuffer.append("\n");
}
}
As far as I can tell, Android's HttpURLConnection doesn't support receiving chunks of data across a persistent HTTP connection; it instead waits for the response to fully complete.
Using HttpClient, however, works:
HttpClient httpClient = new DefaultHttpClient();
try {
HttpUriRequest request = new HttpGet(new URI("https://www.yourStreamingUrlHere.com"));
} catch (URISyntaxException e) {
e.printStackTrace();
}
try {
HttpResponse response = httpClient.execute(request);
InputStream responseStream = response.getEntity().getContent();
BufferedReader rd = new BufferedReader(new InputStreamReader(responseStream));
String line;
do {
line = rd.readLine();
// handle new line of data here
} while (!line.isEmpty());
// reaching here means the server closed the connection
} catch (Exception e) {
// connection attempt failed or connection timed out
}
I'm trying to do a post method for a REST service, but I'm not getting any response from server:
public JSONObject postValues (String strUrl, String strJsonArray) throws Exception{
JSONObject jsonObject = null;
URL url = new URL(strUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
strJsonArray = "data=" + strJsonArray;
Log.e("result",""+strJsonArray);
OutputStream os = conn.getOutputStream();
os.write(strJsonArray.getBytes());
os.flush();
conn.connect();
if (conn.getResponseCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ conn.getResponseCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
String output;
StringBuilder sb = new StringBuilder();
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
Log.e("output",output);
sb.append(output);
}
Log.e("output",sb.toString());
jsonObject = new JSONObject(sb.toString());
conn.disconnect();
return jsonObject;
}
When I see my logCat a get:
output {}
I know that the server is working right because I'm using the "advanced REST client" plugin of google chrome. If I call the URL manually (using the plugin of course)I get the desired answer:
{"message":"OK","code":200}
But if I try to use my function, my strJsonArray is inserted but I get an empty respond from server.
Is there anything wrong with my code?.
Everything looks good...
You could use Wireshark to capture the packets sent to and received from the server using an emulator and the chrome rest client. Then you can compare them and maybe find out what's wrong.
You could also check if theres something in the error stream (conn.getErrorStream()).
I want to send my id & password to server and get the response from server. Here is my code. It is not working for the first time. But iam getting the response from server if i execute my application on second time. It is throwing "Post method failed: -1 null" on first time. Where iam wrong?? Why if() block is executing on first time?? could you please tell me.
HttpsURLConnection con = null;
String httpsURL = "https://www.abc.com/login";
String query = "id=xyz&password=pqr";
URL url = new URL(httpsURL);
con = (HttpsURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("Content-length", String.valueOf(query.length()));
con.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
con.setRequestProperty("User-Agent","Mozilla/4.0(compatible; MSIE 5.0; Windows 98; DigExt)");
con.setDoInput(true);
con.setDoOutput(true);
DataOutputStream output = new DataOutputStream(con.getOutputStream());
output.writeBytes(query);
output.close();
int respCode = con.getResponseCode();
if (respCode != HttpsURLConnection.HTTP_OK)
{
throw new Exception("POST method failed: " + con.getResponseCode()+ "\t" + con.getResponseMessage()); }
else {
//read the content from server
}
1/ It is recommanded to use apache HttpClient rather than URLConnection (see http://developer.android.com/reference/org/apache/http/impl/client/DefaultHttpClient.html)
2/ for login and password, why not use Http Authentication ? both basic and digest are supported by android.
3/ as for you problem, you don't close the underlying outputStream.
you should do:
OutputStream os = con.getOutputStream();
DataOutputStream output = new DataOutputStream(os);
output.writeBytes(query);
output.close();
os.close();
Check Server service validity with other technology and/or classic java. You didn say in your question if you succeed to discriminate the server from the issue.
from java doc ...getResponseCode returns -1 if no code can be discerned from the response (i.e., the response is not valid HTTP).
Java https post request example : http://www.java-samples.com/java/POST-toHTTPS-url-free-java-sample-program.htm
try to close your outputstream after querying the status and not before...that may help
Here is how you should send POST requests in Android
HttpPost httpGet = new HttpPost(server + "/login?email="+username+"&password="+password);
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(httpGet);
You can read response using:
response.getEntity().getContent()
I want to use assembla apis from android environment for my project.
I am trying to do basic authentication as follow :
String authentication = "username:password";
String encoding = Base64.encodeToString(authentication.getBytes(), 0);
URL url = new URL("https://www.assembla.com/");
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Authorization", "Basic " + encoding);
conn.setDoOutput(true);
conn.connect();
System.out.println(conn.getResponseCode());
System.out.println(conn.getResponseMessage());
I am getting 400 and Bad Request in output.
is there something wrong with URL that i am using or some other thing is going wrong?
It looks like the question was answered here. You need to use Base64.NO_WRAP flag when encoding username-password pair:
String encoding = Base64.encodeToString(authentication.getBytes(), Base64.NO_WRAP);
By default the Android Base64 util adds a newline character to the end of the encoded string. This invalidates the HTTP headers and causes the "Bad request".
The Base64.NO_WRAP flag tells the util to create the encoded string without the newline character thus keeping the HTTP headers intact.
REST API with HTTP Authentication Output:- I got the result
String authentication = "username:password";
String encoding = Base64.encodeToString(authentication.getBytes(), Base64.NO_WRAP);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setDoOutput(true);
conn.setRequestProperty ("Authorization", "Basic " + encoding);
conn.connect();
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write( data );
wr.flush();
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while((line = reader.readLine()) != null)
{
// Append server response in string
sb.append(line + "\n");
}
Content = sb.toString();