UI does nothing
when inspected in network panel, its a 401 Unauthorized Response

When using the "Explain" block, which is supposed to explain code using ML, it returns a blank response. The reason for this is that it's trying to make POST request that returns a 405 response (method not allowed).

The endpoint it is trying to reach is "https://blocks-sandbox.githubnext.com/api/explain", one possible cause is that you have to remove the 'sandbox' part from it.

Some other reasons why this might be happening might be:

• The server does not accept POST requests to that URL or there’s a redirect involved converting the request to a GET.
• Your browser is making a preflight request, which uses the OPTIONS HTTP method. This is to check whether the server will allow the POST request (the 405 status code is sent in the response to the OPTIONS request, not the POST request).
• The POST method might not be allowed on which you are sending the request and the request is simply denying you to make any POST request by sending 405 error response

See the screenshots below for more details.

Screenshot of the POST request that's not being allowed

Example 'blank' response returned by the explanation block

The 'Explain' block

Feature Request
Extensions like .json, .yml, .rb, .html etc.

This is in another repo, but trying to consolidate all issues for now within this repo.

See link: https://blocks.githubnext.com/githubnext/blocks-tutorial?path=Diagram.mermaid&fileRef=&blockKey=jaked__mermaid-block__mermaid-block

The code tour example uses https://github.com/fullstackio/cq as a dependency, and it crashes the block because of the error

caught (in promise) ReferenceError: process is not defined
    at <anonymous>:225:8738
    at <anonymous>:21:540
    at <anonymous>:249:31896
    at BlockBundle (<anonymous>:261:1270)
    at $9 (index-9736b164.js:47:538)
    at j9 (index-9736b164.js:47:1437)
    at D9 (index-9736b164.js:47:1685)
    at o (i

The error happens in the deployed code as well as in development.

MDX is pickier about syntax than GitHub-Flavored Markdown:

• it doesn't accept unclosed tags, so e.g. unclosed <img> tags are not supported (example, example)
• "Expected Unicode escape sequence \uXXXX" (example)