golang passing data payload from HTTP client

Question

I have an HTTPS endpoint that works fine with a cURL command like this:

curl -k -u xyz:pqr \
  --data "grant_type=client_credentials" \
  https://my-url

Now I am trying to use golang to call the same API endpoint like this:

data := url.Values{}
data.Set("grant_type", "client_credentials")
req, err := http.NewRequestWithContext(
  ctx,
  "POST",
  "https://my-url",
  strings.NewReader(data.Encode())
)

It fails with the error body:

  {
     "error_description":"grant_type is required",
      "error":"invalid_request"
  }

I am already passing grant_type as the last argument to the http.NewRequestWithContext() function.

What am I missing?

not knowing the specifics of the endpoint you're calling, one can only guess, but you're probably missing the Content-Type, or user auth — blackgreen
– blackgreen ♦, Commented May 19, 2022 at 19:31
You have -u xyz:pqr in your curl command setting a user:pass auth. You need to do that in the golang too. — Steven Masley
– Steven Masley, Commented May 19, 2022 at 19:43

Steven Masley · Accepted Answer · 2022-05-19 19:47:19Z

1

You are not translating the curl correctly. This tool might be helpful: https://mholt.github.io/curl-to-go/

Essentially you need to add user auth.

req.SetBasicAuth("xyz", "pqr")
// Might help to set the `Content-Type` too
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

-k on curl seems to be reading some curl arguments from a file too. You are going to want to make sure you translate those over as well. I cannot see what they are from your example.

answered May 19, 2022 at 19:47

Steven Masley

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