Add accept and content-type headers silently

Author: oliemansm

graphiql-spring-boot-autoconfigure/src/main/java/graphql/kickstart/graphiql/boot/GraphiQLController.java

@@ -61,14 +61,6 @@ private void loadProps() throws IOException {
   private void loadHeaders() {
     PropertyGroupReader propertyReader = new PropertyGroupReader(environment, "graphiql.headers.");
     headerProperties = propertyReader.load();
-    addIfAbsent(headerProperties, "Accept");
-    addIfAbsent(headerProperties, "Content-Type");
-  }
-
-  private void addIfAbsent(Properties headerProperties, String header) {
-    if (!headerProperties.containsKey(header)) {
-      headerProperties.setProperty(header, MediaType.APPLICATION_JSON_VALUE);
-    }
   }
 
   public byte[] graphiql(String contextPath, @PathVariable Map<String, String> params, Object csrf) {

graphiql-spring-boot-autoconfigure/src/main/resources/graphiql.html

@@ -101,12 +101,22 @@
 
   var headers = ${headers}
 
+  function addRequiredHeadersIfAbsent() {
+    if (!headers['Accept']) {
+      headers['Accept'] = 'application/json'
+    }
+    if (!headers['Content-Type']) {
+      headers['Content-Type'] = 'application/json'
+    }
+  }
+
   function onEditHeaders(newHeaders) {
     try {
        headers = JSON.parse(newHeaders)
     } catch(e) {
        headers = {}
     }
+    addRequiredHeadersIfAbsent()
   }
 
   // Defines a GraphQL fetcher using the fetch API. You're not required to
@@ -162,7 +172,7 @@
   props.onEditVariables = onEditVariables
   props.onEditOperationName = onEditOperationName
   props.onEditHeaders = onEditHeaders
-  props.headers = props.headers || {}
+  props.headers = props.headers || '{}'
   if (headers) {
     var newHeaders = Object.assign({}, JSON.parse(props.headers), headers)
     props.headers = JSON.stringify(newHeaders, undefined, 2)

graphql-kickstart-spring-support/src/main/java/graphql/kickstart/spring/AbstractGraphQLController.java

@@ -75,8 +75,7 @@ public Object graphqlPOST(
     throw new ResponseStatusException(HttpStatus.UNPROCESSABLE_ENTITY, "Could not process GraphQL request");
   }
 
-  @GetMapping(value = "${graphql.url:graphql}",
-      produces = MediaType.APPLICATION_JSON_VALUE)
+  @GetMapping(value = "${graphql.url:graphql}", produces = MediaType.APPLICATION_JSON_VALUE)
   public Object graphqlGET(
       @Nullable @RequestParam("query") String query,
       @Nullable @RequestParam(value = "operationName", required = false) String operationName,