Modify endpoints in own server section of AWS S3

[nerg4l]

The first PR to change the endpoints in the documentation.

https://github.com/transloadit/uppy/blob/960362b373666b18a6970f3778ee1440176975af/packages/%40uppy/companion/src/server/controllers/s3.js#L439-L447

Related to #213

[Murderlon]

Thanks for making a PR.

Now that I think about it, does it make sense to duplicate endpoints of the example? I feel like it's just likely to get out of date again.

Some alternatives:

1. Instead of writing the endpoints and a link the example root, we can also create to steps:
   1. Setup Uppy client
   2. Setup your server
2. Or we keep the HTTP methods but remove the specific endpoints and add a sentence above that you need you need these endpoints but it's up to you to decide under which route they fall, as long as you keep it in sync with Uppy.

What do you think?

[nerg4l]

I'm still getting familiar with the available Uppy components.

These endpoints will only change if @uppy/companion changes, am I wrong?

I think @uppy/aws-s3-multipart could be used for the "Setup Uppy client". That component has a predefined set of routes.

Also, @uppy/companion has great documentation for the routes. Example: https://github.com/transloadit/uppy/blob/960362b373666b18a6970f3778ee1440176975af/packages/%40uppy/companion/src/server/controllers/s3.js#L36-L50
Maybe it's enough to put these somewhere on uppy.io.

[Murderlon]

These endpoints will only change if @uppy/companion changes, am I wrong?

No we are updating the section on using it with your own server. At the moment the endpoints don't matter at all. For instance in createMultipartUpload you have to use fetch to your own backend. You're in control what endpoint you fetch, not Uppy.

As discussed before we should change the property name from companionUrl to endpoint and document what to do exactly so you don't have to write this all manually. But until this in there, we need to write docs for the current reality, brining me back to my two suggestions above.

[nerg4l]

From a user's point of view, I think the first option would be better.

[Murderlon]

Would you like to make the change?

[nerg4l]

I will update this PR later today. I can only work on it outside of European working hours.