I have a REST web service written in jRuby with entry point http://localhost:4567/v4/start.htm
The web service downloads data from SQL server and sends it to a client.
How do I use C# and httpWebrequest to access the functions provided by the web service.
Thank you
Generally speaking you're going to do something like this:
HttpWebRequest Request = WebRequest.Create(Url) as HttpWebRequest;
Request.Method = "GET"; //Or PUT, DELETE, POST
Request.ContentType = "application/x-www-form-urlencoded";
using (HttpWebResponse Response = Request.GetResponse() as HttpWebResponse)
{
if (Response.StatusCode != HttpStatusCode.OK)
throw new Exception("The request did not complete successfully and returned status code " + Response.StatusCode);
using (StreamReader Reader = new StreamReader(Response.GetResponseStream()))
{
string ReturnedData=Reader.ReadToEnd();
}
}
I haven't mixed RoR and C# yet (let alone jRuby), but it should be just a basic modification of the above.
Related
I'm trying to create a simple C# application to consume the GitHub API, but when I try to execute the following code:
HttpWebRequest request = WebRequest.Create("https://api.github.com/users/AndreStoicov/repos") as HttpWebRequest;
request.Method = "GET";
request.Proxy = null;
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
return reader.ReadToEnd();
}
}
It returns Protocol Violation Section=ResponseStatusLine due to me not being an authorized user.
In other words, I want to use the GitHub API without any user authorization; is there any way to perform that?
GitHub rules state you must specify User-Agent header in request:
request.UserAgent = "appname";
It does not require registered credentials, just application name would be enough.
I've followed the following article to set up a simple Web API solution:
http://www.codeproject.com/Articles/350488/A-simple-POC-using-ASP-NET-Web-API-Entity-Framewor
I've omitted the Common project, Log4Net and Castle Windsor to keep the project as simple as possible.
Then I created a WPF project. However, now which project should I reference in order access the WebAPI and the underlying models?
Use the HttpWebRequest class to make request to the Web API. Below a quick sample for something I've used to make requests to some other restful service (that service only allowed POST/GET, and not DELETE/PUT).
HttpWebRequest request = WebRequest.Create(actionUrl) as HttpWebRequest;
request.ContentType = "application/json";
if (postData.Length > 0)
{
request.Method = "POST"; // we have some post data, act as post request.
// write post data to request stream, and dispose streamwriter afterwards.
using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
{
writer.Write(postData);
writer.Close();
}
}
else
{
request.Method = "GET"; // no post data, act as get request.
request.ContentLength = 0;
}
string responseData = string.Empty;
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
responseData = reader.ReadToEnd();
reader.Close();
}
response.Close();
}
return responseData;
There are also a nuget package available called "Microsoft ASP.NET Web API client libraries" which can be used to make requests to the WebAPI. More on that package here(http://www.asp.net/web-api/overview/web-api-clients/calling-a-web-api-from-a-net-client)
When I use the methods below to send an xml request to an asmx service, it works fine, the only difference is is that the content type is application/soap+xml. I am getting the error: 400 Bad Request. Here is the method I am using below to send the request via HTTP Post to the WCF Service:
private static void SendRequest(string request)
{
var req = (HttpWebRequest) WebRequest.Create("http://urltoservice.svc");
req.ContentType = "text/xml";
req.Method = "POST";
using (var stm = req.GetRequestStream())
{
using (var stmw = new StreamWriter(stm))
{
stmw.Write(request);
}
}
byte[] myData;
using (var webResponse = req.GetResponse())
{
var responseStream = webResponse.GetResponseStream();
myData = ReadFully(responseStream);
}
// Do whatever you need with the response
string responseString = Encoding.ASCII.GetString(myData);
}
It seems to throw it at the line: var webResponse = req.GetResponse()
What is the type of service that you are trying to call. Is it REST WCF service or SOAP WCF Service?
You can monitor your request using Fiddler to see how your request looks when it works and when it doesnt.
Also enable Tracing on your service to know why you get a 400 Bad Request.
No idea why this works, if someone can explain it it would be great. I needed to append the method name to URI in order for it to work, for example,
http://urltoservice.svc/MethodToCall
I'm developing the client-side of a third party webservice. The purpose is that I send xml-file to the server.
How should I attach the xml-file to the httpwebrequest? What contentType is needed? More suggestions?
I cannot use mtom or dime.ie because I am using httpwebrequest. I am unable to use WCF either.
Here is a very basic method of sending XML structured data using HttpWebRequest (by the way you need to use request.ContentType = "application/xml";) :
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(myUrl));
request.Method = "POST";
request.ContentType = "application/xml";
request.Accept = "application/xml";
XElement redmineRequestXML =
new XElement("issue",
new XElement("project_id", 17)
);
byte[] bytes = Encoding.UTF8.GetBytes(redmineRequestXML.ToString());
request.ContentLength = bytes.Length;
using (Stream putStream = request.GetRequestStream())
{
putStream.Write(bytes, 0, bytes.Length);
}
// Log the response from Redmine RESTful service
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
Logger.Info("Response from Redmine Issue Tracker: " + reader.ReadToEnd());
}
I use this at one of my projects (NBug) to submit an issue report to my Redmine issue tracker which accepts XML structured data over web requests (via POST). If you need further examples, you can get a couple of fully featured examples here: http://nbug.codeplex.com/SourceControl/list/changesets (click 'Browse' under 'Latest Verion' label on the right then navigate to "NBug\Submit\Tracker\Redmine.cs")
This is driving me a bit nuts. I am trying to do something quite simple, and I have done it many times before. Just trying to call a REST API.
I am trying to call GetMessage with endpoint = "http://feed.linksynergy.com/productsearch?token=717f8c8511725ea26fd5c3651f32ab187d8db9f4b208be781c292585400e682d&keyword=DVD", and it keeps returning empty string. If I pass it any other valid URL, it will work. But if I just copy and paste the original URL into the web browser, it returns fine!
Can any smart developer tell me what's going on?
Code below. Thanks in advance.
James
public string GetMessage(string endPoint)
{
HttpWebRequest request = CreateWebRequest(endPoint);
using (var response = (HttpWebResponse)request.GetResponse())
{
var responseValue = string.Empty;
if (response.StatusCode != HttpStatusCode.OK)
{
string message = String.Format("POST failed. Received HTTP {0}", response.StatusCode);
throw new ApplicationException(message);
}
// grab the response
using (var responseStream = response.GetResponseStream())
{
using (var reader = new StreamReader(responseStream))
{
responseValue = reader.ReadToEnd();
}
}
return responseValue;
}
}
private HttpWebRequest CreateWebRequest(string endPoint)
{
var request = (HttpWebRequest)WebRequest.Create(endPoint);
request.Method = "GET";
request.ContentLength = 0;
request.ContentType = "text/xml";
return request;
}
Not sure why your setting ContentLength/ContentType - that is generally for HTTP POST, where there is a request body for which you write data to via a stream.
This is a HTTP GET, so there is no request body. (just URI w/ query string)
This should work:
using System;
using System.IO;
using System.Net;
using System.Text;
// Create the web request
HttpWebRequest request = WebRequest.Create("http://www.someapi.com/") as HttpWebRequest;
// Get response
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
// Console application output
Console.WriteLine(reader.ReadToEnd());
}
EDIT
#Gabe is also quite right - try this on another computer, that is isn't behind any kind of firewall/proxy server.
My work PC was behind a proxy server, so in order to make REST-based HTTP calls, i needed to do this:
var proxyObject = new System.Net.WebProxy("http://myDomain:8080/", true);
System.Net.WebRequest req = System.Net.WebRequest.Create("http://www.someapi.com/");
req.Proxy = proxyObject;
proxyObject.Credentials = New System.Net.NetworkCredential("domain\username","password")