Remove explicit initial application/json headers fix #262

Author: oliemansm

altair-spring-boot-autoconfigure/src/main/java/graphql/kickstart/altair/boot/AltairController.java

@@ -16,7 +16,6 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.core.env.Environment;
 import org.springframework.core.io.ClassPathResource;
-import org.springframework.http.MediaType;
 import org.springframework.stereotype.Controller;
 import org.springframework.util.StreamUtils;
 import org.springframework.web.bind.annotation.PathVariable;
@@ -62,18 +61,9 @@ private void loadProps() throws IOException {
     private void loadHeaders() throws JsonProcessingException {
         PropertyGroupReader propertyReader = new PropertyGroupReader(environment, "graphiql.headers.");
         Properties headerProperties = propertyReader.load();
-        addIfAbsent(headerProperties, "Accept");
-        addIfAbsent(headerProperties, "Content-Type");
         this.headers = new ObjectMapper().writeValueAsString(headerProperties);
     }
 
-
-    private void addIfAbsent(Properties headerProperties, String header) {
-        if (!headerProperties.containsKey(header)) {
-            headerProperties.setProperty(header, MediaType.APPLICATION_JSON_VALUE);
-        }
-    }
-
     @RequestMapping(value = "${altair.mapping:/altair}")
     public void altair(HttpServletRequest request, HttpServletResponse response, @PathVariable Map<String, String> params) throws IOException {
         response.setContentType("text/html; charset=UTF-8");

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

@@ -28,10 +28,6 @@
           /*Prevents the loading screen from showing until CSS is downloaded*/
           display: none;
         }
-
-
-
-
     </style>
     <div class="loading-screen styled">
         <div class="loading-screen-inner">
@@ -46,9 +42,9 @@
         </div>
     </div>
 </app-root>
-<script type="text/javascript" src="${altairRuntimeJsUrl}"></script>
-<script type="text/javascript" src="${altairPolyfillsJsUrl}"></script>
-<script type="text/javascript" src="${altairMainJsUrl}"></script>
+<script rel="preload" as="script" type="text/javascript" src="${altairRuntimeJsUrl}"></script>
+<script rel="preload" as="script" type="text/javascript" src="${altairPolyfillsJsUrl}"></script>
+<script rel="preload" as="script" type="text/javascript" src="${altairMainJsUrl}"></script>
 </body>
 
 </html>