REST endpoint - Header name invalid

[PaulD]

Hello,

After logging in and get account information, account funds and current orders without error, I am trying to use the REST endpoint https://api.betfair.com/exchange/bet...istEventTypes/ with a WebClient / C# and pass an empty {"filter" : { } } post data.

What I am getting is always an exception with a detail: "Header name is invalid"

The headers I am sending are:

request.Headers.Add("Accept", "application/json");
request.Headers.Add("Content-Type", "text/json");
request.Headers.Add("X-Authentication", <token>);
request.Headers.Add("X-Application", <api-key>);

I tried several variations of header requests like content-type: application/json and not sending some of the others but the exception is always the same.

I am thinking that the POST I have to do needs something different because what it works so far didn't have any data sent.

All the samples I could find in the documentation and here in the forum are using the NG endpoint

Any clues?

[WTPooh]

request.ContentType = "application/json";
request.Accept = "application/json";
request.Headers.Add("X-Authentication", <token>);
request.Headers.Add("X-Application", <api-key>);

[PaulD]

There are no properties 'ContentType' and 'Accept' in WebClient

https://docs.microsoft.com/en-us/dot...tframework-4.8

Changing to:

request.Headers.Add(HttpRequestHeader.Accept, "application/json");
request.Headers.Add(HttpRequestHeader.ContentType, "application/json");

changed nothing

[jabe]

These work for me in VB.Net, but I used the RPC version of JSON:

request.ContentType = "application/json-rpc"
request.Headers.Add(HttpRequestHeader.AcceptCharse t, "ISO-8859-1,utf-8")
request.Headers.Add("X-Authentication", ssoid)
request.Headers.Add("X-Application", appKey)

The following did't work for me and remain asterisked out in my code:

' request.headers.add("Accept: application/json")
' request.Headers.Add("Accept: json")

There's another that does this, but the reasons are losts in the fogs of chronology:

request.Headers.Add("Content-Encoding: gzip")


This might be relevant: mine is not a WebClient, but a WebRequest.

[WTPooh]

Sorry. My answer was about HttpWebRequest.
Add this line to your program:
ServicePointManager.Expect100Continue = false;

using System;
using System.Net;
using System.Text;

namespace ConsoleApp1
{
    class Program
    {     
        static void Main(string[] args)
        {
            ServicePointManager.Expect100Continue = false;

            var appKey = "xxxxxx";
            var sessionToken = "xxxxxxxxxxx";
            var endPoint = "https://api.betfair.com/exchange/betting/rest/v1.0/listEventTypes/";
            var request = new WebClient();  
            request.Headers.Add("Accept", "application/json"); 
            request.Headers.Add("Content-Type", "application/json");
            request.Headers.Add("X-Application", appKey);
            request.Headers.Add("X-Authentication", sessionToken);
            var postData = "{\"filter\":{}}";
            var bytes = Encoding.GetEncoding("UTF-8").GetBytes(postData);
            var response = request.UploadData(new Uri(endPoint), bytes);
        }
    }
}

[PaulD]

ServicePointManager.Expect100Continue = false;

at start of the program fixed everything!

Thank you very much WTPooh

[PaulD]

These work for me in VB.Net, but I used the RPC version of JSON:

request.ContentType = "application/json-rpc"
request.Headers.Add(HttpRequestHeader.AcceptCharse t, "ISO-8859-1,utf-8")
request.Headers.Add("X-Authentication", ssoid)
request.Headers.Add("X-Application", appKey)

The following did't work for me and remain asterisked out in my code:

' request.headers.add("Accept: application/json")
' request.Headers.Add("Accept: json")

There's another that does this, but the reasons are losts in the fogs of chronology:

request.Headers.Add("Content-Encoding: gzip")


This might be relevant: mine is not a WebClient, but a WebRequest.

ServicePointManager.Expect100Continue = false as suggested by WTPooh was the trick but thank you very much jabe for your kind reply!