Add support for application/graphql content type and post query params

[marceloverdijk]

As stated in https://graphql.org/learn/serving-over-http/ besides the 'normal' GET and POST requests the following is recommended:

• If the "query" query string parameter is present (as in the GET example above), it should be parsed and handled in the same way as the HTTP GET case.
• If the "application/graphql" Content-Type header is present, treat the HTTP POST body contents as the GraphQL query string.

If interested I can create a PR for this. Let me know.

Note: in the Micronaut integration lib we are doing the same: https://github.com/micronaut-projects/micronaut-graphql/blob/master/graphql/src/main/java/io/micronaut/graphql/GraphQLController.java#L116-L178

[andimarek]

yes, I think having this also supported would be great... thanks a lot.

[marceloverdijk]

@andimarek this one can be closed now.

[ryonday]

Is this going to make it into a release?

[marceloverdijk]

@ryonday this is already merged to master and will be included in the next release.

[andimarek]

solved via #4