C#•2y ago

✅ Add OAuth 2.0 in HttpClient Request Headers

Hi folks, I tried to request by Get using HttpClient, but in this case, I don't know how can add this "OAuth 2.0" in HttpClient to send. When I use this code I have the unauthorized 401.

var client = new HttpClient();
var request = new HttpRequestMessage
{
    Method = HttpMethod.Get,
    RequestUri = new Uri("myURL"),
    Headers =
    {
        { "Authorization", "token MyTokenCode" },
    },
};
using (var response = await client.SendAsync(request))
{
    response.EnsureSuccessStatusCode();
    var body = await response.Content.ReadAsStringAsync();
    Console.WriteLine(body);
}

var client = new HttpClient();
var request = new HttpRequestMessage
{
    Method = HttpMethod.Get,
    RequestUri = new Uri("myURL"),
    Headers =
    {
        { "Authorization", "token MyTokenCode" },
    },
};
using (var response = await client.SendAsync(request))
{
    response.EnsureSuccessStatusCode();
    var body = await response.Content.ReadAsStringAsync();
    Console.WriteLine(body);
}

28 Replies

HimmDawg•2y ago

Not sure if I understood you correctly. What do you want to add?

Ale KantousianOP•2y ago

How can I add "OAuth 2.0" in my Get, when I try to request with this code, I have the following unauthorized 401 error. My token is correct, because I tested the request in postman

HimmDawg•2y ago

request.Headers.Authorization = new AuthenticationHeaderValue("token", "yourToken");

request.Headers.Authorization = new AuthenticationHeaderValue("token", "yourToken");

You mean this? That's the real token in the picture? You shouldn't post tokens publicly

Ale KantousianOP•2y ago

No, my real token is another one, I put that one just to illustrate in the image

HimmDawg•2y ago

Good 😄

Ale KantousianOP•2y ago

I tried this, but I got the same 401 😕 Sometimes I think this is a bug in .NET

HimmDawg•2y ago

So, when you tried stuff out in postman and it worked there, you could try to copy the headers from postman and add them to your request.

Ale KantousianOP•2y ago

This is my Headers

HimmDawg•2y ago

+7 hidden headers

Ale KantousianOP•2y ago

Hummmmm give me a second

Ale KantousianOP•2y ago

How can I add this in my headers?

HimmDawg•2y ago

I guess those wont be needed

Ale KantousianOP•2y ago

The same again, 401 😕

HimmDawg•2y ago

Hmm, without seeing your code, I'd have to guess from here on. Maybe your url is wrong?

Ale KantousianOP•2y ago

var client = new HttpClient();
var request = new HttpRequestMessage {
    Method = HttpMethod.Get,
    RequestUri = new Uri("MyUrl"),
    Headers =
    {
        { "Authorization", "MyToken" },
        //{ "Postman-Token", "<calculated when request is sent>"},
        //{ "Host", "calculated when request is sent" },
        //{ "User-Agent", "PostmanRuntime/7.32.2" },
        { "Accept", "*/*" },
        { "Accept-Encoding", "gzip, deflate, br" },
        { "Connection", "keep-alive" },
        //{ "Content-Type", "application/json" },
    },
};
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
using (var response = await client.SendAsync(request))
{
    response.EnsureSuccessStatusCode();
    var body = await response.Content.ReadAsStringAsync();
    Console.WriteLine(body);
}

var client = new HttpClient();
var request = new HttpRequestMessage {
    Method = HttpMethod.Get,
    RequestUri = new Uri("MyUrl"),
    Headers =
    {
        { "Authorization", "MyToken" },
        //{ "Postman-Token", "<calculated when request is sent>"},
        //{ "Host", "calculated when request is sent" },
        //{ "User-Agent", "PostmanRuntime/7.32.2" },
        { "Accept", "*/*" },
        { "Accept-Encoding", "gzip, deflate, br" },
        { "Connection", "keep-alive" },
        //{ "Content-Type", "application/json" },
    },
};
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
using (var response = await client.SendAsync(request))
{
    response.EnsureSuccessStatusCode();
    var body = await response.Content.ReadAsStringAsync();
    Console.WriteLine(body);
}

HimmDawg•2y ago

Have you tried using "Bearer" as token prefix?

request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", "yourToken");

request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", "yourToken");

Ale KantousianOP•2y ago

Yes

HimmDawg•2y ago

I#m running out of ideas here fluffyFoxMood

Is there more to the authorization process? Do you have to provide some client id or so in the url?

Ale KantousianOP•2y ago

Unfortunately not, that's why I told you that I think it's some .NET bugs 😕

HimmDawg•2y ago

That's pretty unlikely imo. But no idea what else could be wrong then

Ale KantousianOP•2y ago

So, yesterday I tried several solutions according to the documentation, according to StackOverFlow and today here with your tips, I find it very difficult for 3 different way to all go wrong when all 3 showed similar or identical solutions.

HimmDawg•2y ago

Must be something super obvious but small then fluffyFoxThink