How to calculate the checksum?

Question

htaccess

The transfer goes according to the following rules: 4 bytes of useful information, and 1 more byte for the checksum. What is the best algorithm to choose?

Answer 1

You need a condition like this:
Well, then more conditions, if necessary, or your redirect.

Answer 2

Hamming code , corrects single errors, detects double ones.

Answer 3

Reed-Solomon will most likely be optimal, because 6 bits is enough for Hamming.