I can't require the GuzzleHttp on my server with using composer so I try to find a way to add the package to the server manually. I've try to add guzzle folder to vendor and change the composer.json, composer.log, autoload_namespaces ....etc. Nothing work.
I can't run the page because my homepage is using GuzzleHttp to get JSON from the other page.
You could try adding guzzle straight from the github repository as described at https://lornajane.net/posts/2014/use-a-github-branch-as-a-composer-dependency
You never want to change files inside your vendor repo. It is not supposed to be under revision control and will keep getting over written. Begs the question; why can't you pull the package the "normal way" ?
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