feat: shouldPersistHeaders

Author: vertex451

go.mod

@@ -2,4 +2,4 @@ module github.com/graphql-go/handler
 
 go 1.14
 
-require github.com/graphql-go/graphql v0.8.1 // indirect
+require github.com/graphql-go/graphql v0.8.1

graphiql.go

@@ -66,7 +66,7 @@ func renderGraphiQL(w http.ResponseWriter, params graphql.Params) {
 }
 
 // graphiqlVersion is the current version of GraphiQL
-const graphiqlVersion = "3.8.3"
+const graphiqlVersion = "4.0.5"
 
 // tmpl is the page template to render GraphiQL
 const graphiqlTemplate = `
@@ -196,6 +196,8 @@ add "&raw" to the end of the URL within a browser.
         response: {{ .ResultString }},
         variables: {{ .VariablesString }},
         operationName: {{ .OperationName }},
+		shouldPersistHeaders: true,
+        headerEditorEnabled: true,
       }),
       document.getElementById('graphiql')
     );