Add Content-Type header to requests (#48)

* Add Content-Type header to requests

* Do not set Content-Type header in tests

---------

Co-authored-by: vladhanzha <vladyslav.hanzha@openvpn.com>

Author: vladhss

cloudconnexa/cloudconnexa.go

@@ -128,6 +128,7 @@ func (c *Client) DoRequest(req *http.Request) ([]byte, error) {
 
 	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", c.Token))
 	req.Header.Set("User-Agent", c.UserAgent)
+	req.Header.Set("Content-Type", "application/json")
 
 	res, err := c.client.Do(req)
 	if err != nil {

cloudconnexa/cloudconnexa_test.go

@@ -15,7 +15,6 @@ func setupMockServer() *httptest.Server {
 		switch r.URL.Path {
 		case "/api/v1/oauth/token":
 			if r.Method == "POST" {
-				w.Header().Set("Content-Type", "application/json")
 				response := Credentials{AccessToken: "mocked-token"}
 				err := json.NewEncoder(w).Encode(response)
 				if err != nil {
@@ -25,9 +24,7 @@ func setupMockServer() *httptest.Server {
 				http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
 			}
 		case "/valid-endpoint":
-			if r.Method == "GET" {
-				w.Header().Set("Content-Type", "application/json")
-			} else {
+			if r.Method != "GET" {
 				http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
 			}
 		default: