HTTP - Post

main.go

package main
import (    "encoding/json"    "fmt"    "net/http"
    "github.com/graphql-go/graphql"    "github.com/graphql-go/graphql/examples/todo/schema")
type postData struct {    Query     string                 `json:"query"`    Operation string                 `json:"operation"`    Variables map[string]interface{} `json:"variables"`}
func main() {    http.HandleFunc("/graphql", func(w http.ResponseWriter, req *http.Request) {        var p postData        if err := json.NewDecoder(req.Body).Decode(&p); err != nil {            w.WriteHeader(400)            return        }        result := graphql.Do(graphql.Params{            Context:        req.Context(),            Schema:         schema.TodoSchema,            RequestString:  p.Query,            VariableValues: p.Variables,            OperationName:  p.Operation,        })        if err := json.NewEncoder(w).Encode(result); err != nil {            fmt.Printf("could not write result to response: %s", err)        }    })
    fmt.Println("Now server is running on port 8080")
    fmt.Println("")
    fmt.Println(`Get single todo:curl \-X POST \-H "Content-Type: application/json" \--data '{ "query": "{ todo(id:\"b\") { id text done } }" }' \http://localhost:8080/graphql`)
    fmt.Println("")
    fmt.Println(`Create new todo:curl \-X POST \-H "Content-Type: application/json" \--data '{ "query": "mutation { createTodo(text:\"My New todo\") { id text done } }" }' \http://localhost:8080/graphql`)
    fmt.Println("")
    fmt.Println(`Update todo:curl \-X POST \-H "Content-Type: application/json" \--data '{ "query": "mutation { updateTodo(id:\"a\", done: true) { id text done } }" }' \http://localhost:8080/graphql`)
    fmt.Println("")
    fmt.Println(`Load todo list:curl \-X POST \-H "Content-Type: application/json" \--data '{ "query": "{ todoList { id text done } }" }' \http://localhost:8080/graphql`)
    http.ListenAndServe(":8080", nil)}