How can I make a request with a bearer token in Go

Question

I need to make a GET request to an API with a bearer token in the authorization request. How can I do this in Go? I have the following code, but I haven't had success.

package main  import (     "io/ioutil"     "log"     "net/http" )  func main() {     url := "https://api.globalcode.com.br/v1/publico/eventos"      resp, err := http.Get(url)     resp.Header.Add("Bearer", "token")     if err != nil {         log.Println("Erro ao realizar request.\n[ERRO] -", err)     }      body, _ := ioutil.ReadAll(resp.Body)     log.Println(string([]byte(body))) } 

Answer 1

For control over HTTP client headers, redirect policy, and other settings, create a Client:

package main  import (     "io/ioutil"     "log"     "net/http" )  func main() {     url := "https://api.globalcode.com.br/v1/publico/eventos"      // Create a Bearer string by appending string access token     var bearer = "Bearer " + <ACCESS TOKEN HERE>      // Create a new request using http     req, err := http.NewRequest("GET", url, nil)      // add authorization header to the req     req.Header.Add("Authorization", bearer)      // Send req using http Client     client := &http.Client{}     resp, err := client.Do(req)     if err != nil {         log.Println("Error on response.\n[ERROR] -", err)     }     defer resp.Body.Close()      body, err := ioutil.ReadAll(resp.Body)     if err != nil {         log.Println("Error while reading the response bytes:", err)     }     log.Println(string([]byte(body))) } 

The Client's Transport typically has internal state (cached TCP connections), so Clients should be reused instead of created as needed. Clients are safe for concurrent use by multiple goroutines.

A Client is higher-level than a RoundTripper (such as Transport) and additionally handles HTTP details such as cookies and redirects.

For more information on Client and Transport check golang spec for net/http package

Answer 2

I made a super-little-basic library for execute basic request like:

package main import (      request "github.com/alessiosavi/Requests" )  func main(){     // Create a key-value list of headers     headers := request.CreateHeaderList(`Accept`, `application/json`, "Authorization", "Bearer "+auth.IAMToken)     resp :=request.SendRequest(`http://your_site.com`, `GET`, headers, nil)) } 

Here you can find the request implementation:
https://github.com/alessiosavi/Requests/blob/e7ca66bde738b6224fba2b6f146a8dbee67d3323/Requests.go

Here you can find how i use the library for Bearer Auth and other auth type:
https://github.com/alessiosavi/GoCloudant/blob/a8ad3a7990f04ea728bb327d6faea6af3e5455ca/cloudant.go