chore: remove duplicate setting of header params (#249)

* chore: remove duplicate setting of header params

* chore: fixed client test by adding contentType

client/client.go

@@ -143,7 +143,7 @@ func (c *Client) SendRequest(method string, rawURL string, data url.Values,
 
 	//For HTTP GET Method there are no body parameters. All other parameters like query, path etc
 	// are added as information in the url itself. Also while Content-Type is json, we are sending
-	// json body. In that case, data variable conatins all other parameters than body, which is the
+	// json body. In that case, data variable contains all other parameters than body, which is the
 	//same case as GET method. In that case as well all parameters will be added to url
 	if method == http.MethodGet || contentType == jsonContentType {
 		if data != nil {
@@ -178,10 +178,6 @@ func (c *Client) SendRequest(method string, rawURL string, data url.Values,
 
 	}
 
-	if contentType == urlEncodedContentType {
-		req.Header.Add("Content-Type", urlEncodedContentType)
-	}
-
 	req.SetBasicAuth(c.basicAuth())
 
 	// E.g. "User-Agent": "twilio-go/1.0.0 (darwin amd64) go/go1.17.8"

client/client_test.go

@@ -180,7 +180,10 @@ func TestClient_SendRequestWithData(t *testing.T) {
 		t.Run(tc, func(t *testing.T) {
 			data := url.Values{}
 			data.Set("foo", "bar")
-			resp, err := testClient.SendRequest(tc, dataServer.URL, data, nil) //nolint:bodyclose
+			headers := map[string]interface{}{
+				"Content-Type": "application/x-www-form-urlencoded",
+			}
+			resp, err := testClient.SendRequest(tc, dataServer.URL, data, headers) //nolint:bodyclose
 			assert.NoError(t, err)
 			assert.Equal(t, 200, resp.StatusCode)
 		})