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read onedrive api errors

I am current using the following to try and create an upload session with the onedrive api
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.Headers["Authorization"] = "Bearer " + nODUserTokenObj.Access_Token;
request.ContentType = "application/json";
string data =
#"{
""#microsoft.graph.conflictBehavior"": ""replace""
}";
byte[] postBytes = Encoding.ASCII.GetBytes(data);
request.ContentLength = postBytes.Length;
request.Accept = "application/json";
request.GetRequestStream().Write(postBytes, 0, postBytes.Length);
using (HttpWebResponse httpWebResponse = (HttpWebResponse)request.GetResponse())
{
using(StreamReader sr = new StreamReader(httpWebResponse.GetResponseStream()))
{
string theData = sr.ReadToEnd();
JObject test = JObject.Parse(theData);
}
}
Currently I am receiving an exception stating
The remote server returned an error: (409) Conflict.
However looking at the Microsoft documentation I should have a json object returned to me with more information.
What am I doing wrong that I am getting an exception thrown when it hits (HttpWebResponse)request.GetResponse() as opposed to receiving a json object with more error details?

I came across two solutions:
I initially resolved this by sending the request through Fiddler and reading the response there. This was fine for my situation as I was developing and just trying to figure out how the onedrive api functioned.
A solution going forward would be to follow something like this post suggests (How to get error information when HttpWebRequest.GetResponse() fails)
To summarize the post:
catch (WebException ex)
{
using (var stream = ex.Response.GetResponseStream())
using (var reader = new StreamReader(stream))
{
Console.WriteLine(reader.ReadToEnd());
}
}
catch (Exception ex)
{
// Something more serious happened
// like for example you don't have network access
// we cannot talk about a server exception here as
// the server probably was never reached
}

GetResponse keeps throwing page not found exception

Can you please help me out here? I am trying to get content of any web page. But GetResponse keeps throwing exception page not found. I appreciate your help. Following is my code.
try
{
System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.smallchiptechnologies.com/");
request.Method = "POST";
request.ContentType = "text/plain";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
}
catch (WebException ex)
{
}

First, it looks like it should be GET response, not POST (since you just trying to get data from server and not posting any form data or something similar) so change request.Method = "POST"; to request.Method = "GET";
Second, you're not reading anything from response stream. Add something like this to your code to get page content:
string text;
using (var reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
{
text = reader.ReadToEnd();
}

Have you discarded potential proxy issues? For example, if you are running that code behind a corporate webproxy, you'll need to modify slightly your code in order to support the connection thru that proxy.
Something like this...
webrequest.Proxy = new WebProxy(ProxyServer,ProxyPort);
More details here: https://msdn.microsoft.com/en-us/library/czdt10d3(v=vs.110).aspx

HttpWebRequest.GetResponse() keeps getting timed out

i wrote a simple C# function to retrieve trade history from MtGox with following API call:
https://data.mtgox.com/api/1/BTCUSD/trades?since=<trade_id>
documented here: https://en.bitcoin.it/wiki/MtGox/API/HTTP/v1#Multi_currency_trades
here's the function:
string GetTradesOnline(Int64 tid)
{
Thread.Sleep(30000);
// communicate
string url = "https://data.mtgox.com/api/1/BTCUSD/trades?since=" + tid.ToString();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string json = reader.ReadToEnd();
reader.Close();
reader.Dispose();
response.Close();
return json;
}
i'm starting at tid=0 (trade id) to get the data (from the very beginning). for each request, i receive a response containing 1000 trade details. i always send the trade id from the previous response for the next request. it works fine for exactly 4 requests & responses. but after that, the following line throws a "System.Net.WebException", saying that "The operation has timed out":
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
here are the facts:
catching the exception and retying keeps causing the same exception
the default HttpWebRequest .Timeout and .ReadWriteTimeout are already high enough (over a minute)
changing HttpWebRequest.KeepAlive to false didn't solve anything either
it seems to always work in the browser even while the function is failing
it has no problems retrieveing the response from https://www.google.com
the amount of successful responses before the exceptions varies from day to day (but browser always works)
starting at the trade id that failed last time causes the exception immediately
calling this function from the main thread instead still caused the exception
running it on a different machine didn't work
running it from a different IP didn't work
increasing Thread.Sleep inbetween requests does not help
any ideas of what could be wrong?

I had the very same issue.
For me the fix was as simple as wrapping the HttpWebResponse code in using block.
using (HttpWebResponse response = (HttpWebResponse) request.GetResponse())
{
// Do your processings here....
}
Details: This issue usually happens when several requests are made to the same host, and WebResponse is not disposed properly. That is where using block will properly dispose the WebResponse object properly and thus solving the issue.

There are two kind of timeouts. Client timeout and server timeout. Have you tried doing something like this:
request.Timeout = Timeout.Infinite;
request.KeepAlive = true;
Try something like this...

I just had similar troubles calling a REST Service on a LINUX Server thru ssl. After trying many different configuration scenarios I found out that I had to send a UserAgent in the http head.
Here is my final method for calling the REST API.
private static string RunWebRequest(string url, string json)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
// Header
request.ContentType = "application/json";
request.Method = "POST";
request.AllowAutoRedirect = false;
request.KeepAlive = false;
request.Timeout = 30000;
request.ReadWriteTimeout = 30000;
request.UserAgent = "test.net";
request.Accept = "application/json";
request.ProtocolVersion = HttpVersion.Version11;
request.Headers.Add("Accept-Language","de_DE");
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
byte[] bytes = Encoding.UTF8.GetBytes(json);
request.ContentLength = bytes.Length;
using (var writer = request.GetRequestStream())
{
writer.Write(bytes, 0, bytes.Length);
writer.Flush();
writer.Close();
}
var httpResponse = (HttpWebResponse)request.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var jsonReturn = streamReader.ReadToEnd();
return jsonReturn;
}
}

This is not a solution, but just an alternative:
These days i almost only use WebClient instead of HttpWebRequest. Especially WebClient.UploadString for POST and PUT and WebClient.DownloadString. These simply take and return strings. This way i don't have to deal with streams objects, except when i get a WebException. i can also set the content type with WebClient.Headers["Content-type"] if necessary. The using statement also makes life easier by calling Dispose for me.
Rarely for performance, i set System.Net.ServicePointManager.DefaultConnectionLimit high and instead use HttpClient with it's Async methods for simultaneous calls.
This is how i would do it now
string GetTradesOnline(Int64 tid)
{
using (var wc = new WebClient())
{
return wc.DownloadString("https://data.mtgox.com/api/1/BTCUSD/trades?since=" + tid.ToString());
}
}
2 more POST examples
// POST
string SubmitData(string data)
{
string response;
using (var wc = new WebClient())
{
wc.Headers["Content-type"] = "text/plain";
response = wc.UploadString("https://data.mtgox.com/api/1/BTCUSD/trades", "POST", data);
}
return response;
}
// POST: easily url encode multiple parameters
string SubmitForm(string project, string subject, string sender, string message)
{
// url encoded query
NameValueCollection query = HttpUtility.ParseQueryString(string.Empty);
query.Add("project", project);
query.Add("subject", subject);
// url encoded data
NameValueCollection data = HttpUtility.ParseQueryString(string.Empty);
data.Add("sender", sender);
data.Add("message", message);
string response;
using (var wc = new WebClient())
{
wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
response = wc.UploadString( "https://data.mtgox.com/api/1/BTCUSD/trades?"+query.ToString()
, WebRequestMethods.Http.Post
, data.ToString()
);
}
return response;
}
Error handling
try
{
Console.WriteLine(GetTradesOnline(0));
string data = File.ReadAllText(#"C:\mydata.txt");
Console.WriteLine(SubmitData(data));
Console.WriteLine(SubmitForm("The Big Project", "Progress", "John Smith", "almost done"));
}
catch (WebException ex)
{
string msg;
if (ex.Response != null)
{
// read response HTTP body
using (var sr = new StreamReader(ex.Response.GetResponseStream())) msg = sr.ReadToEnd();
}
else
{
msg = ex.Message;
}
Log(msg);
}

For what it's worth, I was experiencing the same issues with timeouts every time I used it, even though calls went through to the server I was calling. The problem in my case was that I had Expect set to application/json, when that wasn't what the server was returning.

The server committed a protocol violation. Section=ResponseStatusLine when using a tor proxy

I'm trying to send an httpwebrequest using a tor proxy with my asp.net application and I receive this error message when calling the webresponse.GetResponse() method:
The server committed a protocol violation. Section=ResponseStatusLine
I've tried searching for a solution on the web and I found 3 main solutions for this error:
Add to Web.config.
<system.net>
<settings>
<httpWebRequest useUnsafeHeaderParsing="true"/>
</settings>
</system.net>`
Add the line: webRequest.ProtocolVersion = HttpVersion.Version10; to the code.
Add the line request.ServicePoint.Expect100Continue = false; to the code.
Each one of the listed solutions didn't change a thing about the error message.
Here's the request code:
WebRequest.DefaultWebProxy = new WebRequest("127.0.0.1:9051");
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
webRequest.CookieContainer = new CookieContainer();
webRequest.ProtocolVersion = HttpVersion.Version10;
webRequest.KeepAlive = false;
webRequest.Method = "GET";
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
webRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.168 Safari/535.19";
HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
StreamReader streamReader = new StreamReader(webResponse.GetResponseStream());
string html = streamReader.ReadToEnd();
webResponse.Close();
return html;
Can anyone help me find a solution for this?

You can get more details about the exception you are getting which is actually a WebException by looking at the Response property of the exception and then checking the StatusDescription and StatusCode properties. That will help you get more details about the error and hopefully point you in the right direction.
Something like this:
catch(WebException e)
{
if(e.Status == WebExceptionStatus.ProtocolError)
{
Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
}
}
Also, take a look at WebException.Status example on MSDN to get more details

I had the same problem. httpwebrequest getresponse method always return error protocol vialotion and i solved probled this way ;
first of all i use xml com object instead of xdocument or xmldocument.
this com object's have a few version Microsft XML , v3.0-v5.0-v6.0. i used v6.0.
MSXML2.DOMDocument60Class doc = new MSXML2.DOMDocument60Class();
doc.setProperty("ServerHTTPRequest",true);
doc.setProperty("ProhibitDTD", false);
doc.async = false;
doc.load(extURL);
if (doc.parseError.errorCode != 0)
{
// error
}
else
{
// do stuff
}

Programmatically call webmethods in C#

I'm trying to write a function that can call a webmethod from a webserive given the method's name and URL of the webservice. I've found some code on a blog that does this just fine except for one detail. It requires that the request XML be provided as well. The goal here is to get the request XML template from the webservice itself. I'm sure this is possible somehow because I can see both the request and response XML templates if I access a webservice's URL in my browser.
This is the code which calls the webmethod programmatically:
XmlDocument doc = new XmlDocument();
//this is the problem. I need to get this automatically
doc.Load("../../request.xml");
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://localhost/dummyws/dummyws.asmx?op=HelloWorld");
req.ContentType = "text/xml;charset=\"utf-8\"";
req.Accept = "text/xml";
req.Method = "POST";
Stream stm = req.GetRequestStream();
doc.Save(stm);
stm.Close();
WebResponse resp = req.GetResponse();
stm = resp.GetResponseStream();
StreamReader r = new StreamReader(stm);
Console.WriteLine(r.ReadToEnd());

Following on from the comments above. If you have a WSDL file that describes your service you use this as the information required to communicate with your web service.
Using a proxy class to communicate with your service proxy is an easy way to abstract yourself from the underlying plumbing of HTTP and XML.
There are ways of doing this at run-time - essentially generating the code that Visual Studio generates when you add a web service reference to your project.
I've used a solution that was based on: this newsgroup question, but there are also other examples out there.

FYI, your code is missing using blocks. It should be more like this:
XmlDocument doc = new XmlDocument();
//this is the problem. I need to get this automatically
doc.Load("../../request.xml");
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://localhost/dummyws/dummyws.asmx?op=HelloWorld");
req.ContentType = "text/xml;charset=\"utf-8\"";
req.Accept = "text/xml";
req.Method = "POST";
using (Stream reqstm = req.GetRequestStream())
{
doc.Save(reqstm);
}
using (WebResponse resp = req.GetResponse())
{
using (Stream respstm = resp.GetResponseStream())
{
using (StreamReader r = new StreamReader(respstm))
{
Console.WriteLine(r.ReadToEnd());
}
}
}