Add support for overriding ajax calls with custom transport methods

[jbuckner]

Context

The Internet Archive's Distributed Web project (https://dweb.me) uses different protocols than just http / https, including WebTorrent and ipfs. This means we need a method other than using a standard Ajax requests for it to work in the Dweb version.

Proposal & Constraints

When we initialize BookReader, we pass in an options object with configuration options. We could potentially add a configuration option to let the consumer define a function that will be used in place of the ajax requests. NOTE This is just an idea and will need to be prototyped for feasibility.

Success Metrics

If Mitra is able to integrate the BookReader into the IA Decentralized Website, this is successful.

Stakeholders

@mitra42

[mitra42]

Is this the same as the issue with the DwebImage tag, or is that getting its own ticket ?

[jbuckner]

@mitra42 The image tag override is covered in #126

[imskr]

Do you mean adding something like this:

// Request with custom header
$.ajax({
    url: 'foo/bar',
    headers: { 'x-my-custom-header': 'some value' }
});

[mitra42]

Not as simple .... Its more of a section like ...

if (!opts.ajaxintercept) { 
  fetch(url, opts, cb)
} else { 
  opts.ajax.intercept(url, opts, cb)
}

So calling out to a provided function . (I'd hope we weren't still using jquery ajax calls inside bookreader, but a similar process could be used with $.ajax)