A long thread becomes easier to help when the latest reply acts as a short status report. State the original goal in one sentence, then list the tests already tried with their outcomes. Separate confirmed observations from guesses and note which earlier assumptions changed.
For instance, “The error occurs on the hosted instance, not locally; two browsers show the same result; I have not checked the reverse proxy” gives a reader a useful starting point. Link to the relevant earlier reply if it contains logs or code, but do not force someone to read every message to learn the current state. End with one unresolved question and the smallest next check you can perform.