Develop Reference

Error: (416) Requested Range Not Satisfiable.on POST Request

I guys, i need to make a POST request but i been rejected with a Remote server Error: (416) Requested Range Not Satisfiable. with a request structured like this:
req.Method = "POST";
req.Host = "launches-api.endclothing.com";
req.KeepAlive = true;
req.ContentLength = sentData.Length;
req.Accept = "application/json, text/plain, */*";
req.ContentType = "application/json;charset=UTF-8";
req.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36";
req.Headers["Origin"] = "https://launches.endclothing.com";
req.Headers["Sec-Fetch-Site"] = "same-site";
req.Headers["Sec-Fetch-Mode"] = "cors";
req.Headers["Sec-Fetch-Dest"] = "empty";
req.Headers["Access-Control-Allow-Origin"] = "https://launches.endclothing.com";
req.Referer = "https://launches.endclothing.com/";
req.Headers[HttpRequestHeader.AcceptEncoding] = "gzip, deflate, br";
req.Headers[HttpRequestHeader.AcceptLanguage] = "it-IT,it;q=0.9,en-US;q=0.8,en;q=0.7";
The original POST request sniffed from Fiddler got some extra-headers which change at every request and them are mentioned in the OPTIONS package sent before making the request.
Fiddler POST request
OPTIONS package
So i don't know where to take that Headers i am missing in my request.
Can you please give me a tip?

How to get redirect url of http://www.google.com site

I have tried this simple code to get redirect code 307 but failed.
string urlRequest = "http://www.google.com";
request = HttpWebRequest.Create(urlRequest) as HttpWebRequest;
request.AllowAutoRedirect = false;
var response = request.GetResponse();
Expect response status code is 307 and AbsoluteUri = "https://www.google.com" but not?

Google does not initiate a redirect in this case because it cannot be sure that the client supports https. It seems that google checks the UserAgent header of the request and only initiates a redirection when it can be sure the user agent supports https.
string urlRequest = "http://www.google.com";
HttpWebRequest request = HttpWebRequest.CreateHttp(urlRequest);
request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0";
request.AllowAutoRedirect = false;
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
MessageBox.Show(response.StatusCode.ToString());
MessageBox.Show(response.Headers["Location"]);
Other request headers will also influence how Google behaves.

c# HttpWebRequest Returning 403 Forbidden

I'm trying to send an HttpWebRequest To a website .
the request is pretty simple :
var req = (HttpWebRequest)WebRequest.Create("");
req.Host = "";
req.Method = "POST";
req.Accept = "";
req.UserAgent = "";
req.Referer = "";
var res = (HttpWebResponse)req.GetResponse();
but i'm getting 403 Forbidden Exception .
what i cannot understand is the request works perfectly using requests captures tools like Burpsuit etc ...
I didnt forget anything about the request , the method and the host etc is correct . and the useragent is the latest :
Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0
the request Works in my rdp which makes me think about the sender IP . but the issue is the request works with burpsuit and browsers as well .
any help ?
thanks

c# httpwebrequest POST and GET methods (with cookieContainer) c#

I'm trying to login on a xbox live page, and got some problems with that, have no idea why, I think I set everything properly... here is my code
CookieCollection cookies = new CookieCollection();
HttpWebRequest Request = (HttpWebRequest)WebRequest.Create("https://account.xbox.com/en-US/PaymentAndBilling/RedeemCode");
Request.CookieContainer = new CookieContainer();
Request.CookieContainer.Add(cookies);
//Request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko";
HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
Response.Cookies.Add(cookies);
Response.Close();
HttpWebRequest getRequest = (HttpWebRequest)WebRequest.Create("https://login.live.com/");
getRequest.Method = "POST";
getRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko";
getRequest.CookieContainer = new CookieContainer();
getRequest.CookieContainer.Add(cookies);
string postData = String.Format("login=/*dd*/&passwd=/*pass*/");
byte[] byteArray = Encoding.ASCII.GetBytes(postData);
getRequest.ContentLength = byteArray.Length;
Stream newStream = getRequest.GetRequestStream(); //open connection
newStream.Write(byteArray, 0, byteArray.Length); // Send the data.
newStream.Close();
HttpWebResponse getResponse = (HttpWebResponse)getRequest.GetResponse();
getResponse.Cookies = cookies;
StreamReader sr1 = new StreamReader(getResponse.GetResponseStream());
string sourceCode = sr1.ReadToEnd();
richTextBox1.Text = sourceCode;
sr1.Close();
I would really apprieciate any help, or any info where can I find some explain of cookiecontainers, http protocols in c# etc.... as it's my first program working with WebRequests, really thank u for help in advance.

Okay, you're going to hate me, but if I had any choice I would not use HttpwebResponse, I would use http://www.seleniumhq.org/projects/webdriver/
It's so easy because it uses the full blown browser instead of needing to maintain cookies. And if you need to run it interactively, or without the gui you can use SimpleDriver()

Webservice and HttpWebRequest

I have a website with webservice active(prestashop)
This site require an authentication.
I use this code:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36";
request.Method = "GET";
request.Credentials = new NetworkCredential("key", "");
request.PreAuthenticate = true;
//request.Connection
request.Host = "localhost";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
String R = reader.ReadToEnd();
The code is ok but my problem is that there is a login form for the webservice
In fact, the HttpWebRequest object , sends two requests:
with the first answer is not authorized while the second was ok status.
I used fiddler web debbuger.
I apologize for my English.

if the form is submitted using GET method you must pass the form paramaters in the url query string, for instance http://url?username={0}&pass={1}. If it is POST method, you must pass the form info into the http body request. There is a lot of examples in stackoverflow of this. Also you must handle the cookies witch is achieve using the CookieContainer. In the first request intialize the container
request.CookieContainer = new CookieContainer();
when the request comeback with ok status the cookies will be in request.Cookies witch is a CookieCollection instance. Later for further request you must have to pass this cookies in order to retrieve the correct data.
request.CookieContainer = new CookieContainer();
request.CookieContainer.Add(userCookies);
Hope it helps!