Add application/json as content type for JSON requests

src/components/channelMapper/channelMapper.js

@@ -24,6 +24,7 @@ export default class channelMapper {
                     tunerChannelId: channelId,
                     providerChannelId: providerChannelId
                 }),
+                contentType: 'application/json',
                 dataType: 'json'
             }).then(mapping => {
                 const listItem = dom.parentWithClass(button, 'listItem');

src/components/directorybrowser/directorybrowser.js

@@ -169,7 +169,8 @@ import 'emby-button';
             data: JSON.stringify({
                 ValidateWriteable: validateWriteable,
                 Path: path
-            })
+            }),
+            contentType: 'application/json'
         }).catch(response => {
             if (response) {
                 if (response.status === 404) {