Add option to pass prefetched json content

[artemave]

Work around for #29

Usage example:

const httpism = require('httpism')

...
const jwksContent = await httpism.get('https://xyz.eu.auth0.com/.well-known/jwks.json')
const client = jwksClient({
  jwksContent
})
client.getSigningKey(header.kid, function(err, key) {
  ...

[artemave]

A bit more info on the problem. The error is thrown by the request http client that for some reason does not like auth0 tls setup. Demo:

• not working with request http client: https://codesandbox.io/s/3m23yp391
• working with another http client: https://codesandbox.io/s/ppx9r1k79x

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you have not received a response for our team (apologies for the delay) and this is still a blocker, please reply with additional information or just a ping. Thank you for your contribution! 🙇‍♂️

[Somebi]

bump

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you have not received a response for our team (apologies for the delay) and this is still a blocker, please reply with additional information or just a ping. Thank you for your contribution! 🙇‍♂️