Git, fatal: The remote end hung up unexpectedly

Question 1

When I tried to run

git push origin master --force

I just got

Counting objects: 2649, done.
Delta compression uses up to 2 threads.
Compressing objects: 100% (1280/1280), done.
error: RPC failed; result=22, HTTP code = 413 | 116 KiB/s   
fatal: The remote end hung up unexpectedly
Writing objects: 100% (2504/2504), 449.61 MiB | 4.19 MiB/s, done.
Total 2504 (delta 1309), reused 2242 (delta 1216)
fatal: The remote end hung up unexpectedly
Everything up-to-date

Is it something to do with not being secure? I tried creating a public key as the answer for Fatal: The remote end hung up unexpectedly and rerunning it, but it still doesn't work. Am I not actually using the key? If so, how do I use it?

Question 2

This is due to git/https buffer settings.

Run this (taken from Git fails when pushing commit to github):

git config http.postBuffer 524288000

Then, run your original command again.

Git, fatal: The remote end hung up unexpectedly

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