Response status codes indicate whether a specific HTTP request has been completed. Here are the types of response codes.
With these response codes, we decide if Optifine is down or not.
If our test shows that Optifine is up, but you still can't access it, follow these tips.
If our tool shows that Optifine is down, then you can not do much to solve it. Just wait for Optifine to solve the issue.