I am rewriting code from http://blog.blackballsoftware.com/2010/11/03/making-a-facebook-wall-post-using-the-new-graph-api-and-c/ to create a class to post to Facebook. The code works as long as I do not URLEncode the post data. For example: If the post data is "message=Test,please ignore" then it works. If I URLEncode the same data into "message%3dTest%2cplease+ignore" then I get the error {"error":{"message":"(#100) Missing message or attachment","type":"OAuthException","code":100}}.
Should the Post data be URLEncoded? I think it should because if I post a message like this, "Test&Message", then only the word Test appears.
Relevant code is below. If postParams = HttpUtility.UrlEncode(postParams); is commented out, then the code works. If not, Facebook returns the error that the message is missing.
postParams = HttpUtility.UrlEncode(postParams);
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(postParams);
webRequest.ContentLength = bytes.Length;
System.IO.Stream os = webRequest.GetRequestStream();
os.Write(bytes, 0, bytes.Length);
os.Close();
try
{
var webResponse = webRequest.GetResponse();
}
catch (WebException ex)
{
StreamReader errorStream = null;
errorStream = new StreamReader(ex.Response.GetResponseStream());
error = errorStream.ReadToEnd() + postParams;
}
The answer can be found on Stackoverflow at C# Escape Plus Sign (+) in POST using HttpWebRequest. Use Uri.EscapeDataString and not URLEncode. Encode the parameter value only and not the equals sign after the parameter name. Example: message=Test%2Cplease%26%20ignore works but message%3dTest%2Cplease%26%20ignore does not work because the equals after the parameter name is encoded as %3d.
Related
Probably duplicate question but I couldn't find an answer for my problem. I have this code to call a web service:
var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://172.21.122.1:5001/autocomplete");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
//tried this too: httpWebRequest.Accept = "gzip, deflate";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
streamWriter.Write("{ \"message\" : \"mü\" }");
streamWriter.Flush();
streamWriter.Close();
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
response = "";
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
response = streamReader.ReadToEnd();
}
But no matter what Encoding I tried with StreamReader() c'tor, I get this response or worse: {"words":["m\u00fc\u015fteri","m\u00fc\u015fterisiyim""]}
When I use Postman or SoapUI to call the same service with the same request: {"message": "mü"},
response looks ok: {"words": ["müşteri","müşterisiyim"]}
Strange thing is: The same code works OK with many other services. It is only this specific service that the reponse is not correctly encoded. We believe there is a programming error with the service, but what I wonder is how Postman or SoapUI handles this. There should be a control in their code and if the response contains "\uxxxx", then Postman or SoapUI decodes it again.
I've checked all request / response headers in Postman and SoapUI with no luck. What can be the reason?
You have to make sure that your request is encoded correctly:
Set the Content Type to:
httpWebRequest.ContentType = "application/json;charset=UTF-8";
Check if request body is also UTF-8 encoded. Set the StreamWriter encoding to UTF-8 as well:
...
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream(), Encoding.UTF8))
...
If you are getting the request content from other source, make sure to read it also using UTF-8 encoding.
Regex.Unescape(response) worked like a charm, thanks JosefZ!
I am trying to send a String[] array in j2me using ObjectOUputStream, but i keep getting this error,
java.lang.IllegalArgumentException: Not an HTTP URL
Here is my code:
OutputStream os=null;
HttpConnection hc= null;
ObjectOutputStream oj=null;
//get the URL
String serverURL=entry.getUrl();
hc=(HttpConnection)Connector.open(serverURL, Connector.READ_WRITE, true);
hc=(HttpConnection)Connector.open(serverURL);
hc.setRequestMethod (HttpConnection.POST);
hc.setRequestProperty ("Content-Type", "application/x-www-form-urlencoded");
hc.setRequestProperty ("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.0");
hc.setRequestProperty ("Content-Language", "en-US");
System.out.println ("Posting to the URL: " + entry.getVectorParams());
//open the output stream to send the post parameters
//os=hc.openOutputStream();
oj=(ObjectOutputStream)hc.openOutputStream();
//writing post parameters
String[] bg=entry.getVectorParams();
oj.writeObject(bg);
Please give a suggestion.
I checked my URL, it is correct and regarding Connector.open(), i pasted it twice here, not in my actual code. Is there anything else that I am doing wrong?
The System.out.println("Posting to the URL: " + entry.getVectorParams()), this only prints the post parameters, I have the serverurl passed in here:
String serverURL=entry.getUrl();
hc=(HttpConnection)Connector.open(serverURL, Connector.READ_WRITE, true);
My server URL is : http://localhost:8080/Web/gServer.jsp
The value of your serverURL variable must not be a valid URL. Try printing it out, and checking.
You have this debug statement:
System.out.println ("Posting to the URL: " + entry.getVectorParams());
but that is printing out the params, not the url. You should print out the serverURL variable.
Also, you are calling Connector.open() twice in a row. There's no need for that.
Update: I also think there could be a problem with the way you're writing the POST parameters to your connection's OutputStream. I wouldn't use an ObjectOutputStream. See something like this for an example of making J2ME POST calls. Basically, you make a String of the POST parameters, separated by &, and then use String.getBytes() to convert to a byte[] for writing to the OutputStream.
I am using following code to retrieve facebook accessToken
string url = "https://graph.facebook.com/oauth/access_token?" +
"client_id={0}" +
"&redirect_uri={1}" +
"&client_secret={2}" +
"&code={3}";
url = string.Format(url, clientId, redirectUri.EncodeUrl(), clientSecret, code);
//Create a webrequest to perform the request against the Uri
WebRequest request = WebRequest.Create(url);
try
{
//read out the response as a utf-8 encoding and parse out the access_token
using (WebResponse response = request.GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
//string urlRedirects = response.ResponseUri.ToString();
Encoding encode = Encoding.GetEncoding("utf-8");
if (stream != null)
{
StreamReader streamReader = new StreamReader(stream, encode);
string accessToken = streamReader.ReadToEnd().Replace("access_token=", "");
streamReader.Close();
response.Close();
return accessToken;
}
}
}
}
catch
{
return null;
}
however I am constantly receiving this ambiguous error message
{
"error": {
"message": "Error validating verification code.",
"type": "OAuthException",
"code": 100
}
}
I checked the code 100 "Invalid parameter" doesn't means much to me at all.
anyone have had similar problem?
Check you are adding correct code in the url
For example
http://www.xyz.com/?code=AQC399oXame3UKmoAMYnqkZOEXPDNa8ZUFEY9sc6I4YNQnNT-ZgHzpMNnQVZrCUBZVqJRIB1QrXC5xW58_8MNIgQol_PaQvYssUM8OiKjSY5aoqGLBMuCeeHsSqP_mRTd1xiK0iretZcXwMm_27lFYrWFw345Mxod_lfJuB8zI13E8wJUQiArXW_ZlGLNcyxh20#_=_
Code must be
code = AQC399oXame3UKmoAMYnqkZOEXPDNa8ZUFEY9sc6I4YNQnNT-ZgHzpMNnQVZrCUBZVqJRIB1QrXC5xW58_8MNIgQol_PaQvYssUM8OiKjSY5aoqGLBMuCeeHsSqP_mRTd1xiK0iretZcXwMm_27lFYrWFw345Mxod_lfJuB8zI13E8wJUQiArXW_ZlGLNcyxh20
code should not include following in the end
#_=_
If above did not solve the problem
2. redirect_uri must end with /
redirect_uri=http://www.xyz.com/
The following gives some times above mentioned error
redirect_uri=http://www.xyz.com
3. A lso make sure
App on Facebook and Website with Facebook Login are set with same addresss
e.g http://www.xyz.com/
You need to send the user to the Facebook Login page to get a valid code. The code should then be used to get the access_token for the user.
Follow the Authentication Guide.
I also got error message 400, when my app id and secret were wrong (i had messed up develop and production id-s and secrets).
Fixing them (watch also out for the correct host) fixed this problem for me.
I am using MonoTouch to build an iPhone app. In the app I am making Web Requests to pull back information from the web services running on our server.
This is my method to build the request:
public static HttpWebRequest CreateRequest(string serviceUrl, string methodName, JsonObject methodArgs)
{
string body = "";
body = methodArgs.ToString();
HttpWebRequest request = WebRequest.Create(serviceUrl) as HttpWebRequest;
request.ContentLength = body.Length; // Set type to POST
request.Method = "POST";
request.ContentType = "text/json";
request.Headers.Add("X-JSON-RPC", methodName);
StreamWriter strm = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);
strm.Write(body);
strm.Close();
return request;
}
Then I call it like this:
var request = CreateRequest(URL, METHOD_NAME, args);
request.BeginGetResponse (new AsyncCallback(ProcessResponse), request);
And ProcessResponse looks like this:
private void ProcessResponse(IAsyncResult result)
{
try
{
HttpWebRequest request = (HttpWebRequest)result.AsyncState;
using (HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(result)) // this is where the exception gets thrown
{
using (StreamReader strm = new System.IO.StreamReader(response.GetResponseStream()))
{
JsonValue value = JsonObject.Load(strm);
// do stuff...
strm.Close();
} // using
response.Close();
} // using
Busy = false;
}
catch(Exception e)
{
Console.Error.WriteLine (e.Message);
}
}
There is another question about this issue for Monodroid and the answer there suggested explicitly closing the output stream. I tried this but it doesn't solve the problem. I am still getting a lot of ReadDone2 errors occurring.
My workaround at the moment involves just re-submitting the Web Request if an error occurs and the second attempt seems to work in most cases. These errors only happen when I am testing on the phone itself and never occur when using the Simulator.
Whenever possible try to use WebClient since it will deal automatically with a lot of details (including streams). It also makes it easier to make your request async which is often helpful for not blocking the UI.
E.g. WebClient.UploadDataAsync looks like a good replacement for the above. You will get the data, when received from the UploadDataCompleted event (sample here).
Also are you sure your request is always and only using System.Text.Encoding.ASCII ? using System.Text.Encoding.UTF8 is often usedm, by default, since it will represent more characters.
UPDATE: If you send or receive large amount to byte[] (or string) then you should look at using OpenWriteAsync method and OpenWriteCompleted event.
This is a bug in Mono, please see https://bugzilla.xamarin.com/show_bug.cgi?id=19673
I make a post request of base64 encoded data to the receipt verification address as follows (this is in C#):
var postSerializer = new JavaScriptSerializer();
byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(Receipt);
string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
var temp = new Dictionary<string, string>();
temp.Add("receipt-data", returnValue);
string jsonReceipt = postSerializer.Serialize(temp);
request.Method = "POST";
request.ContentType = "application/json";
byte[] postBytes = System.Text.Encoding.ASCII.GetBytes(jsonReceipt);
request.ContentLength = postBytes.Length;
Stream dataStream = request.GetRequestStream();
// Write the data to the request stream.
dataStream.Write(postBytes, 0, postBytes.Length);
// Close the Stream object.
dataStream.Close();
WebResponse response = request.GetResponse();
// Display the status.
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
// Get the stream containing content returned by the server.
dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
I'm pretty sure things are in the right format because I'm not getting any exceptions back
from the apple receipt verification endpoint. The entirety of the response I get back is
{status : -42352}
And I can't find out what this error means anywhere. Does anyone know what this means or if there's an error in my code?
Just solved the same problem. Got the solution from here: Verify receipt for in App purchase
The problem was in post encoding. When I encoded post on my server using
$receipt = json_encode(array("receipt-data" => base64_encode($receiptdata)));
I had the same -42352 status. When I used my own function for encoding on iPhone - everything worked! Magic...