Provide headers with sendIntrospectionQuery

[MarcelCutts]

When using sendIntrospectionQuery, a naked request is made.

Apollo-Codegen's version of this tool allows your to specify headers. This is a super useful when trying to grab the schema of GraphQL services that may live on the web and require authorisation - e.g. github's GraphQL endpoint.

This update allows you to pass multiple headers to sendIntrospectionQuery with the -H or ---headers flag.

It also adds a bit of guidance and help to the program, making it a bit easier on the user.

❯ node sendIntrospectionQuery.js --help
Usage: sendIntrospectionQuery.js <url>  [--headers "key:value"]

Commands:
  sendIntrospectionQuery.js url  URL of the GraphQL endpoint

Options:
  --version      Show version number                                   [boolean]
  -H, --headers  Additional Headers to send with introspection query     [array]
  -?, --help     Show help                                             [boolean]

Examples:
  sendIntrospectionQuery.js                 Get GraphQL Schema
  https://example.com/graphql
  sendIntrospectionQuery.js                 Get GraphQL Schema with
  https://example.com/graphql --headers     Authorisation header
  "Authorisation: <token>"

[mhallin]

Hello!

Thank you for this. I will be releasing a new version of this package on the weekend.