CODEWITHSUNDEEP
c#.nethttprequesthttpwebrequesthttp-status-code-411
markzzz
markzzz

Reputation: 47995

Why do I get 411 Length required error in my HttpWebRequest?

This is how I call a service with .NET:

var requestedURL = "https://accounts.google.com/o/oauth2/token?code=" + code + "&client_id=" + client_id + "&client_secret=" + client_secret + "&redirect_uri=" + redirect_uri + "&grant_type=authorization_code";
HttpWebRequest authRequest = (HttpWebRequest)WebRequest.Create(requestedURL);
authRequest.ContentType = "application/x-www-form-urlencoded";
authRequest.Method = "POST";
WebResponse authResponseTwitter = authRequest.GetResponse();

but when this method is invoked, I get:

Exception Details: System.Net.WebException: The remote server returned an error: (411) Length Required.

what should I do?

Upvotes: 78

Views: 201514

Answers (10)

Jordan McGillivray
Jordan McGillivray

Reputation: 1

In my case, it was because I did not have -d '' on my line. I guess it was required at the end point unknowingly.

Upvotes: 0

Tama Yoshi
Tama Yoshi

Reputation: 313

We had a very surprising cause to this error: we passed a header in which there was a newline character (in our case an Authorization bearer token header).

Our suspicion is that the newline confused the headers' parser, and made it think there were no additional headers, which caused it to drop important headers like content-length.

Upvotes: 1

Solomon Thomas
Solomon Thomas

Reputation: 21

Change the way you requested the method from POST to GET ..

Upvotes: 2

Youcef Kelanemer
Youcef Kelanemer

Reputation: 107

I had the same error when I imported web requests from fiddler captured sessions to Visual Studio webtests. Some POST requests did not have a StringHttpBody tag. I added an empty one to them and the error was gone. Add this after the Headers tag:

    <StringHttpBody ContentType="" InsertByteOrderMark="False">
  </StringHttpBody>

Upvotes: 0

Musakkhir Sayyed
Musakkhir Sayyed

Reputation: 7170

var requestedURL = "https://accounts.google.com/o/oauth2/token?code=" + code + "&client_id=" + client_id + "&client_secret=" + client_secret + "&redirect_uri=" + redirect_uri + "&grant_type=authorization_code";
HttpWebRequest authRequest = (HttpWebRequest)WebRequest.Create(requestedURL);
authRequest.ContentType = "application/x-www-form-urlencoded";
authRequest.Method = "POST";
//Set content length to 0
authRequest.ContentLength = 0;
WebResponse authResponseTwitter = authRequest.GetResponse();

The ContentLength property contains the value to send as the Content-length HTTP header with the request.

Any value other than -1 in the ContentLength property indicates that the request uploads data and that only methods that upload data are allowed to be set in the Method property.

After the ContentLength property is set to a value, that number of bytes must be written to the request stream that is returned by calling the GetRequestStream method or both the BeginGetRequestStream and the EndGetRequestStream methods.

for more details click here

Upvotes: 4

shimi_tap
shimi_tap

Reputation: 7962

Hey i'm using Volley and was getting Server error 411, I added to the getHeaders method the following line : 

params.put("Content-Length","0");

And it solved my issue

Upvotes: 1

Save
Save

Reputation: 11938

When you make a POST HttpWebRequest, you must specify the length of the data you are sending, something like:

string data = "something you need to send"
byte[] postBytes = Encoding.ASCII.GetBytes(data);
request.ContentLength = postBytes.Length;

if you are not sending any data, just set it to 0, that means you just have to add to your code this line:

request.ContentLength = 0;

Usually, if you are not sending any data, chosing the GET method instead is wiser, as you can see in the HTTP RFC

Upvotes: 17

iabbott
iabbott

Reputation: 881

Google search

2nd result

System.Net.WebException: The remote server returned an error: (411) Length Required.

This is a pretty common issue that comes up when trying to make call a REST based API method through POST. Luckily, there is a simple fix for this one.

This is the code I was using to call the Windows Azure Management API. This particular API call requires the request method to be set as POST, however there is no information that needs to be sent to the server.

var request = (HttpWebRequest) HttpWebRequest.Create(requestUri);
request.Headers.Add("x-ms-version", "2012-08-01"); request.Method =
"POST"; request.ContentType = "application/xml";

To fix this error, add an explicit content length to your request before making the API call.

request.ContentLength = 0;

Upvotes: 0

Ehsan
Ehsan

Reputation: 32701

you need to add Content-Length: 0 in your request header.

a very descriptive example of how to test is given here

Upvotes: 46

Atlasmaybe
Atlasmaybe

Reputation: 1549

When you're using HttpWebRequest and POST method, you have to set a content (or a body if you prefer) via the RequestStream. But, according to your code, using authRequest.Method = "GET" should be enough.

In case you're wondering about POST format, here's what you have to do :

ASCIIEncoding encoder = new ASCIIEncoding();
byte[] data = encoder.GetBytes(serializedObject); // a json object, or xml, whatever...

HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.Method = "POST";
request.ContentType = "application/json";
request.ContentLength = data.Length;
request.Expect = "application/json";

request.GetRequestStream().Write(data, 0, data.Length);

HttpWebResponse response = request.GetResponse() as HttpWebResponse;

Upvotes: 91

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