so I'm trying to do a GET Request to my web service, and since I saw that the HttpGet class is being deprecated, I try to use the HttpURLConnection class instead, and I used it successfully with a 'POST' method... however when I try to do a simple 'GET' request - I get a 405 error (bad method).
I tested the link in DHC, and the link is fine.
Here's my method:
public JSONObject getClientByDeviceId (String link) {
try {
URL url = new URL(link);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// conn.setRequestMethod("GET");
// conn.setDoOutput(true);
// conn.setDoInput(true);
// conn.setUseCaches(false);
// conn.setAllowUserInteraction(false);
// conn.setRequestProperty("Content-Type", "application/json");
OutputStream outputStream = conn.getOutputStream();
outputStream.close();
if (conn.getResponseCode() != 200) {
Log.e("conn", "Error code: " + conn.getResponseCode());
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close();
conn.disconnect();
JSONObject returnedObject = new JSONObject(sb.toString());
if (returnedObject != null) {
Log.e("conn", "If 400, this is the object gained: " + returnedObject.getString("Message"));
} else {
Log.e("conn", "didn't get any JSON object");
}
conn.disconnect();
return returnedObject;
}
else {
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
Log.e("conn", "GREAT SUCCESS !!: " + conn.getResponseCode());
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close();
conn.disconnect();
JSONObject returnedObject = new JSONObject(sb.toString());
return returnedObject;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
Normally I would say that this problem is caused by trying to do a 'GET' request in a 'POST' URL. But without the two HttpGet and HttpPost classes I don't really know where to turn, all the properties that are commented out are like that because I tried them in the POST request and now I deleted one by one to try to get the method to work.
Any ideas ? or reference to an updated guide on how to properly use that HttpURLConnection class, since I couldn't find one.
Thanks in advance !
Solved it, apparently this code needed to be removed:
OutputStream outputStream = conn.getOutputStream();
outputStream.close();
I guess it was because I gave a GET URL and put that outputStream in my code and that caused the issues.
I still however don't understand why I got the "405: method GET not allowed" whereas I think I should have gotten the opposite: "POST" not allowed...
Anyway that is my solution, thanks a lot for your help guys !
HTTP 405 is caused by bad method call (Method not Allowed). That means you called GET method on POST request or vice-versa. You should add handling for you GET method on your Web-Service to get it working.
For anyone still reaching here from a search engine, my solution was similar -
I removed the line "conn.setDoOutput(true);" (or set it to false)
Related
Can u please help me to understand with simple piece of java code to get connect wth qc 12 using rest api.
I gone thorough the rest api documentation but am not clear with how to start with.but it will be helpful if people can show me a simple java code for authentication(login,logout or getting defect details) using rest api. Also want to know do i need to include any jars in my build path.
Thanks a lot friends.
I don't quite get what you're asking, but if you want to connect to a REST API, there are several ways... I usually use HttpURLConnection, here's an example of a get:
public String getProfile(String URL) throws IOException {
URL getURL = new URL(url);
//Establish a https connection with that URL.
HttpURLConnection con = (HttpURLConnection) getURL.openConnection();
//Select the request method, in this case GET.
con.setRequestMethod("GET");
//Add the request headers.
con.setRequestProperty("header", headerValue);
System.out.println("\nSending 'GET' request to URL : " + url);
int responseCode;
try {
responseCode = con.getResponseCode();
System.out.println("Response Code : " + responseCode);
} catch (Exception e) {
System.out.println("Error: Connection problem.");
}
InputStreamReader isr = new InputStreamReader(con.getInputStream());
BufferedReader br = new BufferedReader(isr);
StringBuffer response = new StringBuffer();
String inputLine;
while ((inputLine = br.readLine()) != null) {
//Save the response.
response.append(inputLine + '\n');
}
br.close();
return response.toString();
}
I've been working with the Slack API in java and have been trying to get an HTTP method that can be used like my below example block of code. That code block works, but the issue is I need to also include a 200 response code, and can't figure out how to get it to work.
Basically, how can I, In Java, send an HTTP post and also tag on the 200 status code using the URL and the content?
Current code:
public void httpRequest(URL url, String content) {
try {
byte[] contentBytes = content.getBytes("UTF-8");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setRequestProperty("Accept-Charset", "UTF-8");
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestProperty("Content-Length", Integer.toString(contentBytes.length));
connection.setRequestProperty("Status", Integer.toString(200));
OutputStream requestStream = connection.getOutputStream();
requestStream.write(contentBytes, 0, contentBytes.length);
requestStream.close();
String response = "";
BufferedReader responseStream;
response = "" + ((HttpURLConnection) connection).getResponseCode();
try {
if (((HttpURLConnection) connection).getResponseCode() == 200) {
responseStream = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
} else {
responseStream = new BufferedReader(new InputStreamReader(((HttpURLConnection) connection).getErrorStream(), "UTF-8"));
}
response = responseStream.readLine();
responseStream.close();
} catch (NullPointerException ignored) {
}
} catch (IOException e) {
e.printStackTrace();
}
}
The call to setDoOutput(true) triggers a post, i.e. you do not need to add
connection.setRequestMethod("POST");
Adding a status header to the request is possible, as you have done, but typically one associates status codes with http responses, not requests. - And off course, adding such custom header would only make sense if the server was designed to use this information to anything.
See this big, and highly up-voted answer on java.net.HttpURLConnection.
Also, you have some problems relating to your response variable as well as the BufferedReader. You accidentally override the value you initially assigned to the response field, instead of concatening. Also, your readLine() should probably be in a loop:
String tmp;
while ((tmp = responseStream.readLine()) !=null){
response += tmp;
}
I am having some difficulty receiving the JSON list response from a given URL in my Android application. I am not sure if I am missing a step in firing the GET call, or the problem is on the web service side. Right when the code gets to the "getInputStream" line, it crashes
if (url != null) {
try {
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("GET");
BufferedReader in = new BufferedReader(
new InputStreamReader(httpURLConnection.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
System.out.println(response.toString());
}
catch (IOException e) {
e.printStackTrace();
}
}
The errors given are as follows have to do with NetworkOnMainThread Exceptions as well as a few others. Note: This is within a method that is called in the "onCreate" method, which could also be a source of the problem.
Alright it ended up being the last issue, thanks for the clarification Daniel. I got lazy and did not put it in an ASyncTask. Works great now, thanks!
I am trying to post XML data to a server which processes this XML and gives a response back, some times the XML data can be very large and the server takes a while to process it, in those cases i fail to get any response back instead i receive a IOException with the message "Unexpected end of file from server". I am positive the XML being sent to the server is not full of errors, is there anything i can do on my end to make sure this doesn't happen or is this a server side issue? Below is code fragment of the method i call to post the data.
Thanks.
String encodedData="some XML"
String urlString="example.com"
try {
URL url = new URL(urlString);
HttpURLConnection urlConnection;
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.setRequestMethod("POST");
urlConnection.setRequestProperty("Content-Type", contentType);
urlConnection.setRequestProperty("Content-Length", encodedData.length()+"");
OutputStream os = urlConnection.getOutputStream();
os.write(encodedData.getBytes());
BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "UTF-8"));
StringBuffer sb = new StringBuffer();
String inputLine;
while ((inputLine = in.readLine()) != null) {
sb.append(inputLine);
}
in.close();
} catch (MalformedURLException e) {
logger.debug("MalformedURLException " + e.getMessage());
logger.debug((new StringBuilder()).append("urlString=").append(urlString).toString());
throw (e);
} catch (IOException e) {
logger.debug("IOException " + e.getMessage());
logger.debug((new StringBuilder()).append("urlString=").append(urlString).toString());
throw (e);
}
return sb.toString();
Not much could be done from the client side, it's just a server side issue in which the server takes very long to process the data which results in the servers connection to timeout before it could send a response.
I'm making an http GET request. It works in about 70% of my attempts. For some reason, I sometimes get no response string from a successful connection. I just setup a button in my app which keeps firing the code below. One call might fail to reply with a string, the next call works fine:
private onButtonClick() {
try {
doit();
} catch (Exception ex) {
...
}
}
public void doit() throws Exception {
URL url = new URL("http://www.example.com/service");
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setDoInput(true);
connection.setUseCaches(false);
connection.setAllowUserInteraction(false);
connection.setReadTimeout(30 * 1000);
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Authorization",
"Basic " + Base64.encode("username" + ":" + "password"));
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line = "";
StringBuilder sb = new StringBuilder();
while ((line = in.readLine()) != null) {
sb.append(line);
}
in.close();
connection.disconnect();
// Every so often this prints an empty string!
System.out.println(sb.toString());
}
am I doing something wrong here? It seems like maybe I'm not closing the connection properly from the last call somehow and the response gets mangled or something? I am also calling doit() from multiple threads simultaneously, but I thought the contents of the method are thread-safe, same behavior though,
Thanks
Thanks
That method looks fine. It's reentrant, so calls shouldn't interfere with each other. It's probably a server issue, either deliberate throttling or just a bug.
EDIT: You can check the status code with getResponseCode.
For checking ResponseCode:
BufferedReader responseStream;
if (((HttpURLConnection) connection).getResponseCode() == 200) {
responseStream = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
} else {
responseStream = new BufferedReader(new InputStreamReader(((HttpURLConnection) connection).getErrorStream(), "UTF-8"));
}
For empty content resposneCode is 204. So if u can get empty body just add one more "if" with 204 code.
We also came across with the similar scenario, I came across the following solution for this issue:
- Setting up a user agent string on URLConnection object.
URLConnection conn = url.openConnection();
conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 4.01; Windows NT)");
more details