We are making use of this end point - https://www.googleapis.com/oauth2/v4/token
to get the access token.
We make use of apace HTTP classes to make a POST request to this end point in this way -
HttpPost httpPost = new HttpPost(GET_ACCESS_TOKEN_API);
StringBuilder blr = new StringBuilder().append(CLIENT_ID).append("=")
.append((String) accountCredentials.get(CLIENT_ID)).append("&")
.append(CLIENT_SECRET).append("=")
.append((String) accountCredentials.get(CLIENT_SECRET))
.append("&").append(REFRESH_TOKEN).append("=")
.append((String) accountCredentials.get(REFRESH_TOKEN))
.append("&grant_type=refresh_token")
.append("&redirect_uri=urn:ietf:wg:oauth:2.0:oob");
// The message we are going to post
StringEntity requestBody = new StringEntity(blr.toString());
// the default content-type sent to the server is
// application/x-www-form-urlencoded.
requestBody.setContentType("application/x-www-form-urlencoded");
httpPost.setEntity(requestBody);
// Make the request
HttpResponse response = HttpUtils.getHttpClient().execute(httpPost);
There has been a recent intimation from google to migrate from out-of-band as they have plans to deprecate this.
We make use of it this way as you can see in the code above -append("&redirect_uri=urn:ietf:wg:oauth:2.0:oob");
GET_ACCESS_TOKEN_API is https://www.googleapis.com/oauth2/v4/token.
I saw some posts mentioning that we have to replace this redirect_uri to localhost.
Can someone explain exactly how this works and what change needs to be done to migrate this successfully ? I tried searching through the documentation to see if there any sample examples but couldn't find anything that matches our use case.
I am referring to this site -
https://developers.google.com/api-client-library/java/google-oauth-java-client/support
I tried to browse through samples, guides, but it mostly talks about different API's. I didn't find the github links that much useful.
Any help would be much appreciated.
Related
I'm Benjamin, currently study in IT and doing a simple application for Final Year Project.
The simple application is calling Third Party API (An fashion products company) and returns product description, stock level and etc to users.
First, I don't have any official API documents and everything starts from scratch.
I have been using java - CloseableHttpClient to call an API with the method GET.
Coding works fine BUT I met an error that "no response" or Access Denied if I tried to call the API directly. (without any cookies or with existing cookies from the official website)
Then I tried with a browser(any) to hit the API link, it will return Access Denied
But when I tried with a browser and hit the official website without any login, and hit again the API then able to get responses.
I have been tried to passing the cookies that returned from the official website but still no responses when I call/hit the API link on java code or Postman.
Answer for why calling an API that doesn't have any official documentation as below:
This is an FYP in University, API is selected and provided by University Lecturer.
My code as below :
CloseableHttpClient httpClient = HttpClientBuilder.create()
.setDefaultCookieStore(cookieStoreNew)
.setUserAgent("Mozilla/5.0").build();
HttpGet getRequest = new HttpGet(url);
getRequest.addHeader("accept", "application/json");
getRequest.addHeader(HttpHeaders.USER_AGENT, "Mozilla/5.0");
getRequest.setConfig(requestConfig);
System.out.println("this is get request config : \n"+getRequest);
System.out.println("\n start execute");
HttpResponse response = httpClient.execute(getRequest);//it will stucked here and no reponses
System.out.println("\n end execute");
if (response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatusLine().getStatusCode());
}
Please comment below if you have any idea or any advice and Appreciate your help.
This is not spoon feed, I have been researched for over 2 weeks.
Thanks
I have worked in such scenarios like yours when the written code needs to make any HTTP request to an API (third party).
As far as my experience says, there should be some issue of Authentication for your code.
As you said hitting the same API on browser also says "Access denied", some login credentials must be required by API with the GET request you are sending, so when creds are not found, API responds with "Access Denied"..
Could you check the http status code your getting in postman while you are hitting the API, it must be 401/403(Unauthorized).
if in postman http status code is 401/403 indeed, then Kindly ask your University Lecturer for any logins that might be required to hit the API.
I need to write a HTTP client which to communicate with Floodlight OpenFlow controller via its REST API.
For testing I did it in python, and it worked OK. But now I'm in a situation where it has to be done in Java, of which I'm admittedly still at the beginner's level. One of my apps uses AsyncHttpClient to dispatch async GET requests, and works just fine. Now as a Floodlight's REST client, it has to do POST and DELETE with JSON encoded body. My code for an async POST request works very much as expected.
But no luck with DELETE.
Somehow it doesn't write JSON string into its request body.
The code is almost identical with POST. For debugging, I don't feed an AsyncCompletionHandler instance to execute() method.
System.out.println(ofEntry.toJson()); // this returns {"name": "xyz"} as expected.
Future<Response> f = httpClient.prepareRequest(new RequestBuilder("DELETE")
.setUrl("http://" + myControllerBaseUrl + urlPathFlowPostDelete)
.setHeader("content-type", "application/json")
.setBody(ofEntry.toJson())
.build()).execute();
System.out.println(f.getStatusCode()); // returns 200.
System.out.println(f.getResponseBody()); // returns {"status" : "Error! No data posted."}.
Just to make sure, I peeped into packet dump with wireshark, and found out the server isn't lying :)
The author of the library has written an extensive amount of relevant, valuable information, but unfortunately I can't find example code specifically for building a DELETE request.
I'd very much appreciate any suggestions, pointers, and of course pinpoint solutions!
Not sure that replying to my own question is appropriate here, but I have just found a related thread at the floodlight-dev Google group.
Problem with Static Flow Pusher DELETE REST method
So this could be a problem with Floodlight REST API which requires message body for a DELETE request to identify what to be deleted, whereas AHC is simply compliant with RFC2616.
I will follow the thread at Google group, and see how it will conclude among developers.
HttpGet request = new HttpGet("https://192.168.1.140:8732/...);
I wonder why I can only send successfully for custom headers : UserName and AuthToken if I do the following:
request.setHeader("User-Agent", "android_client");
request.setHeader("Host", "192.168.1.140:8732");
request.addHeader("UserName", mUserName);
request.addHeader("AuthToken", mAuthorizationToken);
Why is that this code NOT sending the UserName but AuthToken only? When the two bottom lines are reversed.
request.setHeader("User-Agent", "android_client");
request.setHeader("Host", "192.168.1.140:8732");
request.addHeader("AuthToken", mAuthorizationToken);
request.addHeader("UserName", mUserName);
Why is this code failing with 400 error code, invalid hostname when I don't specific the host
// request.setHeader("User-Agent", "android_client");
// request.setHeader("Host", "192.168.1.140:8732");
request.addHeader("UserName", mUserName);
request.addHeader("AuthToken", mAuthorizationToken);
If I don't need to send the UserName and AuthToken, I don't really need to set the Host and it works just fine with the code commented out like following
// request.setHeader("User-Agent", "android_client");
// request.setHeader("Host", "192.168.1.140:8732");
Though I don't think that it is related, I want to disclose that I am using self-signed certificate for these http call from android following this blog. Looking forward to the divine revelation for my poor http soul ...
It is a fluke. I couldn't reproduce it anymore. I have been working with the working solution and left it for a while working on different project. I come back and take a look with wire /context logging at oleg suggestion with the help of How to enable logging for apache commons HttpClient on Android I couldn't reproduce the problem anymore. The power of the logging has scared the problem away. Will update if the problem occurs again and if I find out the cause.
--Update--
Apologies for those who helped me, it turns out this is just a problem with Eclipse's debugger. After suspecting that it was leading me wrong, I placed down a couple of System.out.println to watch the variables, and according to them they ARE being changed, and that the debugger was just showing me old information for whatever reason. No clue why that's happening, but the important thing is that the code does apparently actually work.
I'm working on a method to share with twitter for an Android application, and I'm having errors when setting up the HttpURLConnection. I create the connection object as per usual, using the openconnection function of a url then casting it to a HttpURLConnection, and when I subsequently run SetRequestMethod("POST") on the connection, it does absolutely nothing. When I run the code in the debugger line by line, as I go through that line the request method just remains as the default ("GET"). Anyone have any idea as to why this may be happening? I'm getting the same problem with setDoOutput(true) also not changing anything. However, adding a request property does still work. I've been searching around and haven't been able to find anything on this problem, not even another person reporting these problems.
I am not sur whether using HttpURLConnection is the best here.
Did you try the following way?
// Building the POST request
final BasicNameValuePair message = new BasicNameValuePair("yourField", "yourContent");
final List<NameValuePair> list = new ArrayList<NameValuePair>(1);
list.add(message);
final HttpPost httppost = createHttpPost(UrlEncodedFormEntity(list));
// Building the HTTP client
final HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, YOUR_CHOSEN_CONN_TIMEOUT);
HttpConnectionParams.setSoTimeout (httpParameters, YOUR_CHOSEN_SO_TIMEOUT);
final HttpClient httpClient = new DefaultHttpClient(httpParameters);
// Execution of the POST request
final HttpResponse response = httpClient.execute(httppost);
This is the way I usually do, with no problems.
[EDIT: 04-25-2014] Apache's HttpClient was the best approach for Froyo and former versions. Now, according to this article from Android Developers Blog (written after this Q&A), it is better to use URLConnection.
I'm working on a Java application using Seam and I need to forward to a page on a different site, sending some POST data along with it. It needs to occur from the backend.
Any ideas how I can accomplish this?
EDIT: I don't merely need to receive the response - I need to actually direct the user to the new page.
Take a look at HttpClient, you should be able to generate your POST request programatically from the backend, e.g:
PostMethod post = new PostMethod("http://myserver/page.jsp");
post.addParameter("parameter1", "value1");
post.addParameter("parameter2", "value2");
More details here:
http://weblogs.java.net/blog/2006/11/01/quick-intro-httpclient