feat: make json as the default content type.

Author: ghosind

body.go

@@ -16,14 +16,12 @@ func (cli *Client) getRequestBody(opt RequestOptions) (io.Reader, error) {
 	contentType := getContentType(opt.ContentType)
 
 	switch contentType {
-	case "application/json", "": // Default JSON
+	default:
 		data, err := json.Marshal(body)
 		if err != nil {
 			return nil, err
 		}
 
 		return bytes.NewReader(data), nil
-	default:
-		return nil, ErrUnsupportedContentType
 	}
 }

wrapper.go

@@ -20,7 +20,7 @@ func ToObject[T any](resp *http.Response, err error) (*T, *http.Response, error)
 
 	contentType := resp.Header.Get("Content-Type")
 	switch getContentType(contentType) {
-	case "application/json":
+	default:
 		if err := json.NewDecoder(resp.Body).Decode(&out); err != nil {
 			return nil, resp, err
 		}