I am connecting my website to facebook using Facebook Graph API.
public string WebResponseGet(HttpWebRequest webRequest)
{
StreamReader responseReader = null;
string responseData = "";
try
{
responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream());
responseData = responseReader.ReadToEnd();
}
catch
{
throw;
}
finally
{
webRequest.GetResponse().GetResponseStream().Close();
responseReader.Close();
responseReader = null;
}
It gives me an excption Webexception unhandled by user
The remote server returned an error
Any tips on this?
I dont have a lot of programming experience but given this task.. so pls pardon me if its a question which I should be aware of
Thanks
SC
Look at the Response property of the WebException you are thrown. That will contain a message from Facebook which (hopefully) explains the issue
Related
I am trying to retrieve the SES account-level suppression list using AWS SDK in .Net Core:
Below is my code:
public class SimpleEmailServiceUtility : ISimpleEmailServiceUtility
{
private readonly IAmazonSimpleEmailServiceV2 _client;
public SimpleEmailServiceUtility(IAmazonSimpleEmailServiceV2 client)
{
_client = client;
}
public async Task<ListSuppressedDestinationsResponse> GetSuppressionList()
{
ListSuppressedDestinationsRequest request = new ListSuppressedDestinationsRequest();
request.PageSize = 10;
ListSuppressedDestinationsResponse response = new ListSuppressedDestinationsResponse();
try
{
response = await _client.ListSuppressedDestinationsAsync(request);
}
catch (Exception ex)
{
Console.WriteLine("ListSuppressedDestinationsAsync failed with exception: " + ex.Message);
}
return response;
}
}
But it doesn't seem to be working. The request takes too long and then returns empty response or below error if I remove try/catch:
An unhandled exception occurred while processing the request.
TaskCanceledException: A task was canceled.
System.Threading.Tasks.TaskCompletionSourceWithCancellation<T>.WaitWithCancellationAsync(CancellationToken cancellationToken)
TimeoutException: A task was canceled.
Amazon.Runtime.HttpWebRequestMessage.GetResponseAsync(CancellationToken cancellationToken)
Can anyone please guide if I am missing something?
Thank you!
I have tested your code and everything works correctly.
using Amazon;
using Amazon.SimpleEmailV2;
using Amazon.SimpleEmailV2.Model;
internal class Program
{
private async static Task Main(string[] args)
{
var client = new AmazonSimpleEmailServiceV2Client("accessKeyId", "secrectAccessKey", RegionEndpoint.USEast1);
var utility = new SimpleEmailServiceUtility(client);
var result = await utility.GetSuppressionList();
}
}
<PackageReference Include="AWSSDK.SimpleEmailV2" Version="3.7.1.127" />
Things that you can check:
Try again, maybe it was a temporary problem.
Try with the latest version that I am using(if not already)
How far are you from the region that you try to get the list? Try making the same request from an EC2 instance in that region.
Finally found the issue, I was using awsConfig.DefaultClientConfig.UseHttp = true;' in startup` which was causing the issue. Removing it fixed the issue and everything seems to be working fine now.
My website (Spring MVC) allows users to sign up by using their Facebook accounts and sign into my site later with their Facebook accounts. I use scribejava (version 6.6.3) (https://github.com/scribejava/scribejava) for the Oauth integration with Facebook.
I have tested a use case and am unable to find a way to resolve it. Here is the list of steps:
The tester goes to my site's "Log in" page, clicks "Log in with Facebook", grants permissions at Facebook, gets redirected to my site, and signs out. This is a normal and successful flow.
The tester sign into Facebook at Facebook.com
The tester goes to Settings->Apps and Websites and removes my site
The tester goes to my site's "Log in" page, clicks "Log in with Facebook" button, gets redirected to Facebook, and sees an error message.
At step 4, the tester always gets an error message at the Facebook site instead of asking the tester to grant permissions again. See the following screenshot:
I cannot find a way at Facebook to remove this message when clicking on the "Log in with Facebook" button. Here is my code for the web interface. Did I miss something?
#RequestMapping( value="/facebook", method = RequestMethod.GET)
public void facebook(HttpServletRequest request,
#RequestParam(value = "page", required = true) String page,
HttpServletResponse response) throws Exception {
try {
OAuth20Service service = new ServiceBuilder(config.getProperty("facebook.clientId"))
.apiSecret(config.getProperty("facebook.clientSecret"))
.callback(getCallback())
.build(FacebookApi.instance());
String authUrl = service.getAuthorizationUrl();
response.sendRedirect(authUrl);
} catch (Exception e) {
response.sendRedirect("/oauthFail");
}
}
#RequestMapping( value="/facebook/callback", method = RequestMethod.GET)
public void facebookCallback(HttpServletRequest servletRequest,
#RequestParam(value = "code", required = false) String code,
#RequestParam(value = "error", required = false) String error,
HttpServletResponse servletResponse
) throws Exception {
try {
OAuth20Service service = new ServiceBuilder(config.getProperty("facebook.clientId"))
.apiSecret(config.getProperty("facebook.clientSecret"))
.callback(getCallback())
.build(FacebookApi.instance());
OAuth2AccessToken accessToken = service.getAccessToken(code);
final OAuthRequest request = new OAuthRequest(Verb.GET, "https://graph.facebook.com/v3.2/me");
service.signRequest(accessToken, request);
final com.github.scribejava.core.model.Response response = service.execute(request);
String body = response.getBody();
JSONObject jObject = new JSONObject(body);
String email = jObject.getString("email");
//success. use the email to create an account or if the email address exists, direct a userto their account page
} catch (Exception e) {
response.sendRedirect("/oauthFail");
}
}
How to handle this situation? I feel either something is wrong is my code or scribejava has a framework issue. Or this is a Facebook specific issue?
I have just tested the case. Couldn't reproduce.
Did you try running this Example
https://github.com/scribejava/scribejava/blob/master/scribejava-apis/src/test/java/com/github/scribejava/apis/examples/FacebookExample.java
?
I think your problem can be with API versions logic in Facebook.
You can try to explicitly use the latest one .build(FacebookApi.customVersion("3.2"))
I have implemented a REST service using Spring Integration.
When I try to access the service manually using main function, It is working fine.
I also tested the service using REST Client in Google Chrome and that worked. But the service is coming back with responseCode 404 on WebSphere server. So I am facing the issue when I deploy the code on higher environment.
URL u = new URL("http://localhost:8080/MyApplication/testRestService");
URLConnection uc = u.openConnection();
HttpURLConnection connection = (HttpURLConnection) uc;
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Accept","*/*");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStream out = connection.getOutputStream();
Writer wout = new OutputStreamWriter(out);
//helper function that gets a string from a dom Document
String input = jsonInput;
wout.write(input.getBytes());
wout.flush();
wout.close();
// Response
int responseCode = connection.getResponseCode();
Is is dependent on server, so its coming back with response code 404 ? Do we need any server side configuration ?
Any suggestion will be appreciated.
Why do you use different ContentType for URLConnection and for httpClient?
Show, please, your REST service config: 404 means Not found. Therefore you use (or don't) some options in request which makes it non-matching for the server's RequestMapping.
I tried with Apache HTTP Client and the code is working on WebSphere now. Still I am not able to find the reason why java.net.HttpURLConnection was not working on WebSphere.
Please find my updated code below :
DefaultHttpClient httpClient = null;
HttpPost postRequest = null;
StringEntity inputEntity = null;
HttpResponse response = null;
try{
//RETREIVE WEB SERVICE URL FROM DB
String callbackURL = "http://localhost:8080/MyApplication/testRestService";
httpClient = new DefaultHttpClient();
postRequest = new HttpPost(callbackURL);
String inputData = request.toString();
inputEntity = new StringEntity(inputData);
inputEntity.setContentType("application/x-www-form-urlencoded");
postRequest.setEntity(inputEntity);
response = httpClient.execute(postRequest);
if (response.getStatusLine().getStatusCode() != 201 && response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "+ response.getStatusLine().getStatusCode());
}
//System.out.println("HTTP Response Code :"+response.getStatusLine().getStatusCode());
LOGGER.debug("HTTP Response Code :"+response.getStatusLine().getStatusCode());
httpClient.getConnectionManager().shutdown();
}catch(IOException ex){
ex.printStackTrace();
throw ex;
}finally{
httpClient.getConnectionManager().shutdown();
httpClient = null;
postRequest = null;
inputEntity = null;
response = null;
}
I use RESTFull WebService API (BOBJ 4.1) to retrieve the information about the reports in the repository.
When I try to derive the list of data providers, it works file for most of the reports. However, for some of the reports I get back the "(404) not found" message. I appreciate that it's a valid response for reports which don't have any data providers, but I'm sure that the reports I get the 404 message for definitely have one or more data providers. I also don't expect it to be related to the permissions, because I don't get the "access denied" message and I can open the "problematic" reports using the Rich Client.
I use the following link:
http://{servername}:{port}/biprws/raylight/v1/documents/{reportID}/dataproviders
Has anyone experienced this kind of a problem before? Am I missing something?
I was having the same problem with some of the BO REST services (some of which went away after we rebooted our server).
You don't say which technology you're using to call the web services, but here's how you'd get the error information in a C# application.
In my C# app, below are the functions I use to call a GET & POST Business Objects 4.x REST service, and if something goes wrong, it attempts to read in the error message, so we get more than just "404 not found" or "503 Server error"...
To use these functions, you must've logged into BO and got a Login token.
protected string CallGETWebService(string URL, string token)
{
HttpWebRequest GETRequest = null;
try
{
GETRequest = (HttpWebRequest)WebRequest.Create(URL);
GETRequest.Method = "GET";
GETRequest.Accept = "application/xml";
GETRequest.Timeout = 3 * 60 * 1000; // Wait for upto 3 minutes
GETRequest.KeepAlive = false;
GETRequest.Headers.Add("X-SAP-LogonToken", token);
HttpWebResponse GETResponse = (HttpWebResponse)GETRequest.GetResponse();
Stream GETResponseStream = GETResponse.GetResponseStream();
StreamReader reader = new StreamReader(GETResponseStream);
string response = reader.ReadToEnd();
return response;
}
catch (WebException ex)
{
// If the web service throws an exception, attempt to see if it give us any clues about what went wrong.
string exception = GetExceptionMessage(URL, ex);
throw new Exception(exception);
}
}
protected string CallPOSTWebService(string URL, string token, string XMLdata)
{
try
{
// Call a "POST" web service, passing it some XML, and expecting some XML back as a Response.
byte[] formData = UTF8Encoding.UTF8.GetBytes(XMLdata);
HttpWebRequest POSTRequest = (HttpWebRequest)WebRequest.Create(URL);
POSTRequest.Method = "POST";
POSTRequest.ContentType = "application/xml";
POSTRequest.Accept = "application/xml";
POSTRequest.Timeout = 3 * 60 * 1000; // Wait for upto 3 minutes
POSTRequest.KeepAlive = false;
POSTRequest.ContentLength = formData.Length;
POSTRequest.Headers.Add("X-SAP-LogonToken", token);
Stream POSTstream = POSTRequest.GetRequestStream();
POSTstream.Write(formData, 0, formData.Length);
HttpWebResponse POSTResponse = (HttpWebResponse)POSTRequest.GetResponse();
StreamReader reader = new StreamReader(POSTResponse.GetResponseStream(), Encoding.UTF8);
string response = reader.ReadToEnd();
return response;
}
catch (WebException ex)
{
// If the web service throws an exception, attempt to see if it give us any clues about what went wrong.
string exception = GetExceptionMessage(URL, ex);
throw new Exception(exception);
}
}
protected string GetExceptionMessage(string URL, WebException ex)
{
// If one of the BO web service threw an exception, attempt to see if it give us any clues about what went wrong.
string exception = "An exception occurred whilst calling: " + URL + ", " + ex.Message;
try
{
if (ex.Response == null)
return exception;
if (ex.Response.ContentLength == 0)
return exception;
using (Stream sr = ex.Response.GetResponseStream())
{
// The web service will return a string containing XML, which we need to parse, to obtain the actual error message.
StreamReader reader = new StreamReader(sr);
string XMLResponse = reader.ReadToEnd();
XElement XML = XElement.Parse(XMLResponse);
XElement XMLException = XML.Elements().Where(e => e.Name.LocalName == "message").FirstOrDefault();
if (XMLException != null)
exception = XMLException.Value; // eg "Info object with ID 132673 not found. (RWS 000012)"
}
}
catch
{
// If the web service returned some other kind of response, don't let it crash our Exception handler !
}
return exception;
}
The important thing here is that if BO's REST services fail, the GetResponse() will throw a WebException, and we then use my GetExceptionMessage() function to check the error response (which the BO Rest Services return in XML format) and try to extract the error message from it.
Using this functionality, our C# code can throw an exception with some useful information in it:
Info object with ID 132673 not found. (RWS 000012)
..rather than just throwing a vague exception like this (which, by the way, is what all of SAP's own C# examples will do, as none include any error-handling)...
(404) Page not found
(503) Service unavailable
I've also had cases where the BO REST Services will actually throw a "(503) Service Unavailable" exception... which was completely misleading ! Again, this code will help to give us the real error message.
If BO's REST services are successful, they'll return a string containing some XML data. Let's look at some sample code showing how we'd use my functions to call the REST service to get details about a particular Webi Report.
We'll call the REST services, then convert the XML response string into an XElement, so we can obtain the Report's name from the XML.
string token = /* Your login-token */
string URL = string.Format("http://MyServer:6405/biprws/infostore/{0}", ReportID);
string WebiReportResponse = CallGETWebService(URL, token);
// Parse the web service's XML response, and obtain the name of our Webi Report
XElement ReportDetails = XElement.Parse(WebiReportResponse);
XElement title = ReportDetails.Elements().Where(e => e.Name.LocalName == "title").FirstOrDefault();
string ReportName = (title == null) ? "Unknown" : title.Value;
I thoroughly loathe the SAP documentation (and lack of it).
Life would've been MUCH easier if SAP themselves had provided some sample .Net code like this...
I've regularly had this problem in a Java routine that trawls through all WebI reports in the system to find their data-providers. At the start of the routine it works OK but as time progresses it gets slower and throws up more and more of this kind of error. I'm fairly convinced that the program itself does nothing untoward to slow down the system and it calls other BO RESTful services with no problem.
In the end I went back to getting the information using the Java SDK and it works fine. It's also much faster than Restful, even when it's working normally. Using BO 4.1 SP7
I have a processing page and I want to run function process all via web service (add web reference into my C# window form app). My code below:
var context = new ModuleABCService.Screen() // limk web services: http://localhost:8686/soap/DMSBL009.asmx
{
CookieContainer = new CookieContainer(),
AllowAutoRedirect = true,
EnableDecompression = true,
Timeout = 60000
};
var loginResult = context.Login(string.Format("{0}#{1}", val.UserName, company), val.Password);
if (loginResult.Code != ErrorCode.OK)
{
throw new Exception(string.Format("Can not login {0}", company));
}
Content content = context.GetSchema();
context.Clear();
context.Submit(
new Command[]
{
content.Actions.ProcessAll
}
);
And I got an exception message:
System.Web.Services.Protocols.SoapExceptio:n Server was unable to process request. ---> PX.Data.PXUndefinedCompanyException: Unable determine proper company id for the request. at PX.Data.PXDatabaseProviderBase.getCompanyID(String tableName, companySetting& setting) in c:\Builders\4_10-2014_4_28-21_21_17-Full\Scripts\BuildTemp\NetTools\PX.Data\Database\Common\DbProviderBaseCompanies.cs:line 471...
Have you ever got this error before? Could you please give me any suggestion? Thank you so much!
Ok, I found out, because Acumatica's license