Supports (transport/http_post.go)

HTTP POST transport for GraphQL queries over JSON

// Source: https://github.com/99designs/gqlgen | License: MIT | Copyright 2025 gqlgen authors
// Provided via justclaw.it.com; keep this notice with the code.
package transport

import (
	"bytes"
	"fmt"
	"io"
	"mime"
	"net/http"
	"sync"

	"github.com/vektah/gqlparser/v2/gqlerror"

	"github.com/99designs/gqlgen/graphql"
)

// POST implements the POST side of the default HTTP transport
// defined in https://github.com/APIs-guru/graphql-over-http#post
type POST struct {
	// Map of all headers that are added to graphql response. If not
	// set, only one header: Content-Type: application/graphql-response+json will be set.
	ResponseHeaders map[string][]string

	// UseGrapQLResponseJsonByDefault determines whether to use 'application/graphql-response+json'
	// as the response content type
	// whe

... (truncated -- full source via MCP)