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403 Forbidden error while invoking API in c# code

This API is working through postman.
I am trying the same thrid-party API from my application like below:
string requestUrl = string.Empty;
string result = string.Empty;
System.Net.WebClient client = new System.Net.WebClient();
using (client)
{
requestUrl = "https://api.fyndx1.de/hogwarts/aggregators/api/v1/config1/authToken";
client.QueryString.Add("username", "tester");
client.QueryString.Add("password", "pwd123");
result = client.DownloadString(requestUrl);
}
403 error is coming. I tried to add User agent to header parameters after querystring but no use.
client.Headers.Add("User-Agent: Other");
Any help is appreciated. Thanks.

Minecraft authentication servers returning 403 forbidden

So, I'm trying to create a new authToken by sending a POST Request via C# to the minecraft authentication servers (https://authserver.mojang.com/authenticate), but im getting the following error:
System.Net.WebException: 'The remote server returned an error: (403) Forbidden.'
My current code to try and send the request is:
public void ObtainAccessToken(string username, string password)
{
var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://authserver.mojang.com/authenticate");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = "{\"agent\":{\"name\":\"Minecraft\",\"version\":1},\"username\":\"" + username + "\",\"password\":\"" + password + "\"}";
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
}
}
}
from: https://stackoverflow.com/a/28591279/17371073
I'm trying to log into an migrated account

Using my Java implementation from a few years back as a reference, the only difference I see is that I've added Content-Charset UTF-8 and Content-Length with the written payload byte size to the request header (that is, the byte size of the json string that you write). I suspect that I would have never done this if this wasn't necessary.
Edit: Following HTTP specification, your request is only valid if you either:
Include the Content-Length property in your HTTP header.
Close the connection directly after sending the HTTP request.
Since you are waiting for a response, you'll have to use the first option.

Python urllib with proxy not working while C# works

I am trying to get data from an API using python 'urllib.request'. My requests sometime need to post json data.
My network is behind a proxy
When i try to get the data using C# code, everything works great:
WebClient wc = new WebClient();
WebProxy wp = new WebProxy("{IP}", 8080);
wc.Proxy = wp;
var request = "https://{API address and params}";
Uri serviceUri = new Uri(request);
string download = wc.DownloadString(serviceUri);
My python code is:
import urllib
address = "https://{API address and params}"
req = urllib.request.Request(address)
req.set_proxy("{IP}:8080", "http")
response = urllib.request.urlopen(req)
My python code throws a 400 error code exception - 'bad request'
What am i doing wrong?

Post data to php

I ran into a problem lately:
C# code:
string URI = "http://cannonrush.tk/UpdateLogFile.php";
string myParameters = "text=test123";
using (WebClient wc = new WebClient())
{
wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
string HtmlResult = wc.UploadString(URI, myParameters);
Console.WriteLine(HtmlResult);
}
PHP file:
<?php
if (isset($_GET['text'])) {
$file = "LogFile.txt";
$handle = fopen($file, 'a') or die('ERROR: Cannot write to file: ' . $file);
date_default_timezone_set('Europe/Amsterdam');
$data = '~ ' . date('l jS \of F Y h:i:s A') . '>> ' . $_GET['text'] . "\n\n";
fwrite($handle, $data);
fclose($handle);
echo "SUCCESS";
} else {
echo "ERROR: Access forbidden without text";
}
?>
Now, whenever I run the above C# code, I get this output printed:
ERROR: Access forbidden without text
I have tried numerous versions to post data from C# to php, but nothing seems to work.
Any ideas?

Change $_GET["text"] to $_POST["text"] in the php file, or use DownloadString() instead of UploadString() in your C# code.

$_GET is only populated in GET requests, so UploadString will not work:
Uploads the specified string to the specified resource, using the POST method.
If you want to allow either verb, use $_REQUEST instead.

Unable to post a share using Jive REST API - getting 400 Bad Request error

I am trying to post a share on Jive using the /Shares REST API in .net using C#. However I am not able to do this and getting the following error:
"The remote server returned an error: (400) Bad Request."
Following is the code which I have written:
string response = string.Empty;
using(WebClient client = new WebClient())
{
string strJiveShareURL = "https://<JiveURL>";
strJiveShareURL += "/api/core/v3/shares";
var SharedJSON = new AddShareJSON
{
participants = new string[] {"https://<JiveURL>/api/core/v3/people/{username}" },
shared = "https://<<Content URL to be shared>>",
content= new Content
{
type = "text/html",
text = "This is a test share from SharePoint to Jive"
}
};
var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
string shareJSON = serializer.Serialize(SharedJSON);
Console.WriteLine("Setting Credentials:");
string credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes("UID:PWD"));
client.Headers[HttpRequestHeader.Authorization]= "Basic " + credentials;
client.Headers[HttpRequestHeader.Accept] = "application/json";
client.Headers[HttpRequestHeader.ContentType] = "application/json";
//BypassCertificateError();
response = client.UploadString(strJiveShareURL, "POST", shareJSON);
Console.WriteLine("Response:" + response);
Console.ReadLine();
}
and following is the JSON which is created for posting the share:
{
"content": {
"type":"text/html",
"text":"This is a test share from SharePoint to Jive"
},
"participants": ["https://<<Jive URL>>/api/core/v3/people/<<username>>"],
"Shared":"https://<<URL of the Content To be Shared>>"
}
Please let me know if there is anything which I have been doing incorrectly.

I figured this out myself, I was getting the error because I was passing an invalid URI object to the shared parameter of the Share REST endpoint. The shared parameter requires a content URI in the form of
http://[[JiveURL]]/api/core/v3/contents/[[ContentID]]
Earlier I was trying to pass URLs external to Jive resulting in the bad request error.