Solved

C# get request to web service that returns json

Posted on 2014-03-07
3
6,893 Views
Last Modified: 2014-03-12
When I enter the URL manually in IE, I get the json response I expect. However, when I do the following code below, I get this error:

Additional information: The remote server returned an error: (500) Internal Server Error.

string sURL = "http://localhost:56925/Get/GetVMServerInfo?hostName=" + host + "&userName=" + username + "&password=" + password + "&serverName=";

WebRequest request = WebRequest.Create(sURL);
request.Method = "GET";
request.ContentType = "application/json; charset=utf-8";

var response = (HttpWebResponse)request.GetResponse();
string jsonText;
using (var sr = new StreamReader(response.GetResponseStream())) {
   jsonText = sr.ReadToEnd();
}

Open in new window

Error happens at var response = (HttpWebResponse)request.GetResponse(); line 7.

The same with this code:
var jsonText = new WebClient().DownloadString(sURL);
dynamic allServers = JsonConvert.DeserializeObject(jsonText);

Open in new window

Error happens at var jsonText = new WebClient().DownloadString(sURL); line 1.
0
Comment
Question by:itnifl
3 Comments
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 250 total points
ID: 39912998
"Internal Server Error" means that an exception happened in your code on the server--or in the worst case something is wrong with IIS. You need to check that your code isn't throwing any exceptions.

Also, if the service returns JSON, and that's what you want back, then you need to be setting the Accept header, not the Content-Type header. Content-Type is what you are sending; Accept is what you want back. GET requests don't have a content body, so assigning a Content-Type doesn't make sense.
0
 
LVL 15

Assisted Solution

by:Minh Võ Công
Minh Võ Công earned 250 total points
ID: 39914173
Do you try ContentType="application/x-www-form-urlencoded"
http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.contenttype(v=vs.110).aspx
// Set the 'ContentType' property of the WebRequest.
			myWebRequest.ContentType="application/x-www-form-urlencoded";

			// Set the 'ContentLength' property of the WebRequest.
			myWebRequest.ContentLength=byteArray.Length;
			Stream newStream=myWebRequest.GetRequestStream();
			newStream.Write(byteArray,0,byteArray.Length);

			// Close the Stream object.
			newStream.Close();

			// Assign the response object of 'WebRequest' to a 'WebResponse' variable.
			WebResponse myWebResponse=myWebRequest.GetResponse();

Open in new window

0
 
LVL 2

Author Closing Comment

by:itnifl
ID: 39923589
The real problem was that the request was not getting parsed correctly by the web server. But also I used the information both of you gave or linked to, to end up with a correct code.

            try {
               HttpWebRequest request = (HttpWebRequest)WebRequest.Create(sURL);
               request.Method = "GET";
               request.Accept = "application/json; charset=utf-8";
               var response = (HttpWebResponse)request.GetResponse();

               using (var sr = new StreamReader(response.GetResponseStream())) {
                  jsonText = sr.ReadToEnd();
               }
            } catch (Exception e) {
               throw e;
            }
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Learn by example how to specify CSS selectors for Selenium WebDriver test automation software.
Boost your ability to deliver ambitious and competitive web apps by choosing the right JavaScript framework to best suit your project’s needs.
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
The viewer will learn how to dynamically set the form action using jQuery.

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now