HTTPS GET call using HttpClient

Question

I am getting a 400 bad request trying to call an API using HttpClient and I am not exactly sure what I am missing.

I have tried the endpoint from my browser and from Postman and have not had any issues, but when I try to use the following code I get a 400 bad request:

using (HttpClient client = new HttpClient()) { var result = client.GetAsync("https://api.exchange.coinbase.com/products/ETH-USD/candles?granularity=300&start=2022-03-22&end=2022-03-23").Result; }

Would anyone be able to tell me what I am missing to get this to work?

According to this, it returns JSON indicating the problem. Read the response. What does it say? — madreflection
– madreflection, Commented Jun 3, 2022 at 18:17
Is it a web application, if it is then it is an issue of CORS (Cross-Origin Resource Sharing) request — Muhammad Waqas Aziz
– Muhammad Waqas Aziz, Commented Jun 3, 2022 at 18:24

tia · Accepted Answer · 2022-06-03 18:33:44Z

The request from the original code returns {"message":"User-Agent header is required."}. If it is the case, add user-agent header to fix the problem

using System; using System.Net.Http; using System.Net.Http.Headers; using (HttpClient client = new HttpClient()) { client.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue(".NET", "6.0")); var result = await client.GetAsync("https://api.exchange.coinbase.com/products/ETH-USD/candles?granularity=300&start=2022-03-22&end=2022-03-23"); Console.WriteLine(await result.Content.ReadAsStringAsync()); }

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