C# calling a post method in other API getting 404

Question

I am calling a post method from one API to other in C# and getting a 404 Not Found error. When i look at the request message the request Uri looks good but Absolute Uri and Absolute path has some special characters inserted

My request Uri - https://services.abc.com:1232/something/v1/abc/add
My Absolute Uri - https://services.abc.com:1232/something/v1/%E2%80%8Babc%E2%80%8B/add

This is how im calling the end point

var baseUrl = https://services.abc.com:1232/something;     
HttpRequestMessage requestMessage = new HttpRequestMessage(HttpMethod.Post, $"{baseUrl}/v1/abc/add");
requestMessage.Content = new StringContent(JsonConvert.SerializeObject(request), Encoding.UTF8, "application/json");
Task<HttpResponseMessage> response = client.SendAsync(requestMessage);

score 3 · Accepted Answer · answered May 11 '23 at 16:09

%E2%80%8B encodes (for example according to this site) Zero-width space (U+200B) space character which is not shown by Visual Studio (I assume you use it). Try deleting /abc/ part and retyping it manually (or try copying this - $"{baseUrl}/v1/abc/add"), it seems that you have managed to copy-paste the character from somewhere.

Also answer to Zero Width Space character in string literals: Detect and/or prevent can be useful.

C# calling a post method in other API getting 404

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