I have a php service that generates XML. How can I parse the XML in C#? I tried using something like this:
WebRequest request = WebRequest.Create("http://devstage.jokeroo.com/rest.php");
request.Method = "GET";
request.ContentType = "text/html";
IAsyncResult result = request.BeginGetResponse(RequestCallback, request);
private void RequestCallback(IAsyncResult ar)
{
var request = ar.AsyncState as WebRequest;
Stream reader = request.EndGetResponse(ar).GetResponseStream();
//use this reader to read the content
}
But it keeps throwing this exception:
An exception of type 'System.Net.ProtocolViolationException' occurred in System.Windows.ni.dll but was not handled in user code
Any suggestions?
Get rid of this line:
request.ContentType = "text/html";
You're making a GET request so there is no request body; therefore, setting the content type (for a non-existent and non-supported HTTP request body) is what's causing your error.
Related
Trying to call WebServices from C# and getting below error:
System.Net.WebException: 'The remote server returned an error: (502) Bad Gateway
Code:
WebRequest request = WebRequest.Create("https://xxxxx/cgi/webservice.pl?function=get_latest_ts_values&site_list=130105B&datasource=AT&varfrom=10.00&varto=10.00&lookback=60&format=csv");
request.Method = "GET";
WebResponse response = request.GetResponse();
using (Stream dataStream = response.GetResponseStream() )
{
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
Console.WriteLine(responseFromServer);
Console.ReadLine();
}
But works fine when i use Postman or just copy url in browser and also works fine with below python code:
import requests
dataload = {}
dataurl = "https://xxxxx/cgi/webservice.pl?function=get_latest_ts_values&site_list=130105B&datasource=AT&varfrom=10.00&varto=10.00&lookback=60"
headers = {}
response = requests.request("GET", dataurl, headers=headers, data=dataload)
for dataresp in response:
print(dataresp)
What am I doing wrong with C# code?
The uri for the WebRequest has the query parameter &format=csv. Maybe this is why you are getting a 502. The Python request is missing that query parameter. Did you try the WebRequest by removing that part?
Could be incorrect content type or user agent having the wrong information. Postman could be setting these values without your knowledge. Might try in the exception seeing if there is a a response stream and read it through a streamreader to see if there is any more information you're not seeing to point you in the correct direction.
Ended up using RestSharp and it works fine. (https://www.nuget.org/packages/RestSharp)
string Uri = "https://xxxx/cgi/webservice.pl?xxxx";
var client = new RestSharp.RestClient(Uri);
client.Timeout = -1;
var request = new RestRequest(Method.GET);
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);
I'm trying to get the order book from GDAX (link to documentation of the call) but when doing it from the c# executable I always get Error 400 - Bad request.
When taking the actual URL and pasting it into my browser, it works fine.
String URL = "https://api.gdax.com/products/BTC-USD/book?level=2";
WebRequest request = WebRequest.Create(URL);
WebResponse response = request.GetResponse();
The actual issue with your API call is , the API is expecting a user-agent string while making the request: Below is the code in working condition:
try
{
String URL = "http://api.gdax.com/products/BTC-USD/book?level=2";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
request.UserAgent = ".NET Framework Test Client";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
var encoding = ASCIIEncoding.ASCII;
using (var reader = new System.IO.StreamReader(response.GetResponseStream(), encoding))
{
string responseText = reader.ReadToEnd();
}
}
catch(WebException ex)
{
HttpWebResponse xyz = ex.Response as HttpWebResponse;
var encoding = ASCIIEncoding.ASCII;
using (var reader = new System.IO.StreamReader(xyz.GetResponseStream(), encoding))
{
string responseText = reader.ReadToEnd();
}
}
Basically ProtocolError indicates that you have received the response but there is an error related to protocol, which you can observe, when you read the response content from exception. I have added catch to handle the exception and read ex.Response (which is HttpWebResponse) and could see that the API is asking for user-agent to be suppllied while making the call. I got to see the error as "{"message":"User-Agent header is required."}"
You can ignore the code inside the exception block, I used it only to see what is the actual response message, which contains actual error details
Note: I have boxed WebRequest to HttpWebRequest to have additional http protocol related properties and most importantly "UserAgent" property which is not available with the WebRequest class.
You need to Accept the certificarte, Google for access to a https webrequest.
Like this
var url = ConfigurationManager.AppSettings["URL"] + "/Archivador/MoverEnvio";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
if (Certificado != null)
{
// Y añadirlo a la petición HTTP
req.ClientCertificates.Add(Certificado);
}
req.Method = "PUT";
req.ContentType = "application/json";
ArchivadorModelPut Mover = new ArchivadorModelPut()
{
ID_ARCHIVADOR = idArchivador,
ID_ENVIO = idEnvio
};
using (var streamWriter = new StreamWriter(req.GetRequestStream()))
{
string json = JsonConvert.SerializeObject(Mover);
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}
using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
{
StreamReader reader = new StreamReader(resp.GetResponseStream());
var dato = reader.ReadToEnd();
string returnString = resp.StatusCode.ToString();
}
I got this Exception:
System.Net.WebException: 'Error on the remote server: (400) Bad
Request.'
On line:
using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
I don't know how to resolve the problem, can someone help me?
If you need more information about it, let me know.
This exception means that the request was completed successfully, however a 400 HTTP response was returned. A 400 HTTP response normally means that your client did not send the correct data, however its completely up to the destination server under what circumstances a 400 response would be returned.
If you catch the WebException you can use the Response property to look at the HTTP response - depending on the server it might contain a description of the error.
If its normal practice for the destination service to return a 400 response then take a look at Why does HttpWebRequest throw an exception instead returning HttpStatusCode.NotFound? for an extension method that can be used to get the response regardless of the status code. Alternatively you could use an alternative class that doesn't throw, e.g. HttpClient.
I am currently developing in Unity (in particular using C#) and I'm stuck with HttpWebRequest - HttpWebResponse random timeouts.
I have some methods that send a POST request to a server I host on my local machine (XAMPP) to use various php scripts which are going to fetch informations from MySQL Database (hosted with XAMPP) and give back those info in JSON format.
Then I handle these JSON informations with my C# scripts.
The problem is that when I run the first test all is good:I can get the JSON data from my Server and show it in the Debug Console.
When I run the second test,a WebException is raised with error:
WebException - The request timed out
After that second test,if I run again and again,the problem keeps presenting in a random way.
I followed all the guidelines I found on the internet on how to setup a webrequest - webresponse properly,in particular I tried to use ServicePoint.DefaultConnectionLimit and ServicePoint.MaxServicePointIdleTime,without any result.
The general structure of my methods (regarding the web request/response part) is something like that:
public void WebMethod(){
string post_url = "http://localhost/service.php?someparam=1&someparam=2";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(post_url);
request.Method = "POST";
request.KeepAlive = false;
request.Timeout = 5000;
request.Proxy = null;
string Response = "";
try
{
using (HttpWebResponse resp = request.GetResponse() as HttpWebResponse)
{
using (Stream objStream = resp.GetResponseStream())
{
using (StreamReader objReader = new StreamReader(objStream, Encoding.UTF8))
{
Response = objReader.ReadToEnd();
objReader.Close();
}
objStream.Flush();
objStream.Close();
}
resp.Close();
}
}catch(WebException e)
{
Debug.Log(e.Message);
}
finally
{
request.Abort();
}
//tried this one after reading some related answers here on StackOverflow,without results
//GC.Collect();
Debug.Log("SERVER RESPONSE:" + Response);
//Response Handling
}
I know that it may be something related to a wrong abort on the HttpWebRequest / Response or maybe related to the HTTP 1.1 connections limit,but I can't figure out any solution at the moment.
Any help is appreciated.
I currently have the code
try
{
string url = "http://myanimelist.net/api/animelist/update/" + "6.xml";
WebRequest request = WebRequest.Create(url);
request.ContentType = "xml/text";
request.Method = "POST";
request.Credentials = new NetworkCredential("username", "password");
byte[] buffer = Encoding.GetEncoding("UTF-8").GetBytes("<episode>4</episode>");
Stream reqstr = request.GetRequestStream();
reqstr.Write(buffer, 0, buffer.Length);
reqstr.Close();
MessageBox.Show("Updated");
}
catch (Exception s)
{
MessageBox.Show(s.Message);
}
I am trying do send data to myanimelist.net
The code they have written for is this
URL: http://myanimelist.net/api/animelist/update/id.xml
Formats: xml
HTTP Method(s): POST
Requires Authentication:true
Parameters:
id. Required. The id of the anime to update.
Example: http://myanimelist.net/api/animelist/update/21.xml
data. Required. A parameter specified as 'data' must be passed. It must contain anime values in XML format.
Response: 'Updated' or detailed error message.
The usage code example the have stated is this, does anyone know how to do this in c# or what was wrong with my original code?
Usage Examples:
CURL: curl -u user:password -d data="XML" http://myanimelist.net/api/animelist/update/21.xml
edit: When i lauch myanimelist.net it shows that it has not been updated, i am sure that my username and password credentials are correct
Edit 2 : I have now added a response which comes up with the error
"The remote server returned an error: (501) Not Implemented."
You're not actually performing the request, so once you're done writing to the request stream itself, perform the actual web request:
string result;
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
result = reader.ReadToEnd();
}
}
Also, the content type should be text/xml or application/xml - the API may be complaining about that. Read the documentation for their API carefully and ensure what you're sending is correct.