application/graphql content-type support for HTTP POST

[linux-china]

According to GraphQL Serving over HTTP, If the "application/graphql" Content-Type header is present, treat the HTTP POST body contents as the GraphQL query string.

But following code can not work and 404 error thrown.

POST http://localhost:8080/graphql
Content-Type: application/graphql

query {
  bookById(id: "book-1") {
    id
    name
    pageCount
    author {
      firstName
      lastName
    }
  }
}

You should use application/json instead.

POST http://localhost:8080/graphql
Content-Type: application/json

{
  "query": "query {\n  bookById(id: \"book-1\") {\n    id\n    name\n    pageCount\n    author {\n      firstName\n      lastName\n    }\n  }\n}",
  "variables": null
}

application/graphql has good support for code completion especially in JetBrains IDEs and GraphQL plugin.

[bclozel]

Closing as a duplicate of #108