Merge pull request #11 from DevKurka/yagpdb

Do not include Content-Type if body is null

Author: jogramming

restapi.go

@@ -141,7 +141,12 @@ func (s *Session) doRequestLockedBucket(method, urlStr, contentType string, b []
 		req.Header.Set("authorization", s.Token)
 	}
 
-	req.Header.Set("Content-Type", contentType)
+	// Discord's API returns a 400 Bad Request is Content-Type is set, but the
+	// request body is empty.
+	if b != nil {
+		req.Header.Set("Content-Type", contentType)
+	}
+	
 	// TODO: Make a configurable static variable.
 	req.Header.Set("User-Agent", fmt.Sprintf("DiscordBot (https://github.com/jonas747/discordgo, v%s)", VERSION))
 	req.Header.Set("X-RateLimit-Precision", "millisecond")