Develop Reference

How can I send POST parameters with HttpURLConnection POST in java?

I am not familiar with https requests so please take it easy on me.
I want to make a post call and retrieve a token for a url. The url is something like:
/auth/token?param1=value1&param2=value2&param3=value3&param4={{value4}}&param5={{value5}}
I make the post
HttpURLConnection conn = (HttpURLConnection) authentication.openConnection();
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestMethod("POST");
but in order to get the response I have to send the parameters.
I've tried to write the url params as string to the connection outputstream but it doesnt work.
Any help is appreciated.

XML over http using HttpURLConnection - getting error 401

I am trying to send XML over http url using HttpURLConnection.
Following is the test curl command that I am using to test the service.
curl -H "Content-Type: text/xml" -H "User-Agent: some/7.88/1" -X POST
--Basic -u "username:password" -d '< ?xml packet ... >' http://ip:port/some/url
It is working fine, but when I try to send this with following Java code:
Java Code:
URL url = new URL("http://ip:port/some/url");
String requestXMLPacket = "<?xml packet ... >";
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type","text/xml");
conn.setRequestProperty("User-Agent", "some/7.88/1");
conn.setRequestProperty("basic -u", "username:password");
conn.setDoOutput(true);
conn.setInstanceFollowRedirects(false);
conn.setUseCaches(false);
conn.setDoInput(true);
I get an error:
java.io.IOException: Server returned HTTP response code: 401 for URL:
http://ip:port/some/url
Which means that I am not sending correct authorization.
Can you tell me what I am doing wrong here.

Please try adding authentication header as follows
String encoded = Base64.getEncoder().encodeToString((username + ":" + password).getBytes(StandardCharsets.UTF_8));
conn.setRequestProperty("Authorization", "Basic " + encoded);
PS. It uses Java 8 Base64 encoder

HttpUrlConnection PATCH request using Java

I am trying to do a http PATCH request but I always get the 404 error, so maybe the settings of my connection are not correct:
URL url = new URL("MyPath");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestProperty("X-HTTP-Method-Override", "PATCH");
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("Accept", "application/json");
conn.setRequestMethod("POST");
JsonObject jo = createMyJson();
OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream());
out.write(jo.toString());
out.close();
System.out.println(conn.getResponseCode());
System.out.println(conn.getResponseMessage());
I get the 404 error, Not found. When doing the same request using Postman, this is working..
Thank you for your help.

Not all servers support X-HTTP-Method-Override. In that case your last resort is (if you are not using a decent HTTP client) to hack the URLConnection object.
I posted a complete solution here on SO, check it out.

Sending JSON from Android to Nodejs server

I try to send a request from an Android device to a Nodejs server using
HttpURLConnection con = (HttpURLConnection) (new URL(IP + "/getrestaurant")).openConnection();
con.setRequestMethod("POST");
con.setRequestProperty("Accept", "application/json");
con.setDoInput(true);
con.setDoOutput(true);
con.connect();
con.getOutputStream().write("{'restaurant_id':'569a16e28dcdc5c8add2a8e0'}".getBytes("UTF-8"));
con.getOutputStream().flush();
con.getOutputStream().close();
When I print the received request from node js I get:
{
"{'restaurant_id':'569a16e28dcdc5c8add2a8e0'}": ""
}
instead of {'restaurant_id':'569a16e28dcdc5c8add2a8e0'}
How can I get it work? Thanks!

as the comment says(i have too low reputation to comment), {'restaurant_id':'569a16e28dcdc5c8add2a8e0'} is not valid context
also I advice you to use Koush Ion library for json requests . https://github.com/koush/ion
It is very convenient and easy to use for , give it a try . In one line all types of requests are done ,

The problem was that I needed con.setRequestProperty("Content-Type", "application/json; charset=UTF-8");

HTTP 403 while executing a PUT request

I am creating a django rest api, and I'm trying to send JSON data via PUT request from an Android device, using HttpUrlConnection.
URL url = new URL(myurl);
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("PUT");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
conn.setRequestProperty("Accept", "application/json");
Log.v("Apiput", MainActivity.cookieManager.getCookieStore().getCookies().get(0).toString());
conn.connect();
if(conn.getResponseCode() != 200) {
return "" + conn.getResponseCode();
}
OutputStreamWriter osw = new OutputStreamWriter(conn.getOutputStream());
osw.write(put);
osw.flush();
osw.close();`
I know I have to send a csrf token, but I think that I'm sending it already.
By examining the META in my request I can see the csrf token both in headers and cookies:
'HTTP_COOKIE': 'csrftoken=3jLNzfLIu1P5dBH4WWwggHMH7oDQC7Rx;'
And in my android device i have a CookieManager that says that the csrf cookie has the same value.
V/Apiput﹕ csrftoken=3jLNzfLIu1P5dBH4WWwggHMH7oDQC7Rx
I am getting a 403 (Forbidden) Http error besides the user is authenticated (I can make GET Requests)
[26/Sep/2015 00:16:04]"PUT /api/works/34/ HTTP/1.1" 403 58
With curl I am able to send the request without any problem, with the same user credentials.
I wonder if anyone can tell me what am I doing wrong.
Thanks.

You don't have to set the cookie if you're doing a JSON call to Django REST framework.
It would definitively help if you can provide the permissions associated to the view.