Set URL or Title of document library with REST API

Question

I am working on a site provisioning flow and one of the requirements is to keep the URL's as short as possible.

Unfortunately, when I make a document library, I can't set the URL, only the title and the url is generated. Is it possible to change either the URL or the title with REST API for an existing document library? I know I could do this with PowerShell, but this should be a pure Flow solution.

Edit: Trying plan B, change title after creating library. This currently breaks when I add the headers to the request, I can see that the header is escaped, this is the output from Flow:

{
  "Accept": "application/json;odata=verbose",
  "IF-MATCH": "etag or \"*\"",
  "X-HTTP-Method": "MERGE",
  "Content-Type": "application/json;odata=verbose;charset=utf-8"
}

And, the request returns with error:

{
  "status": 412,
  "message": "The request ETag value 'etag or \"*\"' does not match the object's ETag value '\"1\"'.\r\nclientRequestId: 90aeb25e-2228-443e-9d6c-c54dd5d792b7\r\nserviceRequestId: a54ecf9e-e00b-0000-58f3-2e344dfe39c1",
  "source": "....../sites/FullSiteWithFlow/_api/web/lists(guid'7bfbb58a-c777-4ea6-9714-4b082049d72d')",
  "errors": [
    "-1",
    "Microsoft.SharePoint.Client.ClientServiceException"
  ]
}

Answer 1

The approach you need to take for this problem to use the URL value that you want as Title and then change the Title value. So, at the time of creation of doc library, simply use URL value as title and then once the list is created, you can change the list Title value using another HTTP request.

The subsequent HTTP request needs to:

1) Set etag property value in the header as "IF-MATCH": "*"

2) Ensure that you are providing the correct payload as:

body: { '__metadata': { 'type': 'SP.List' }, 'Title': 'Updated Title' }