Merge pull request #5628 from marmelab/Fix-ra-data-simple-rest-delete-fails-because-of-bad-header

Fix ra-data-simple-rest delete method fails because of bad header

Author: djhi

packages/ra-data-simple-rest/src/index.spec.ts

@@ -83,9 +83,9 @@ describe('Data Simple REST Client', () => {
                 'http://localhost:3000/posts/1',
                 {
                     method: 'DELETE',
-                    headers: {
+                    headers: new Headers({
                         'Content-Type': 'text/plain',
-                    },
+                    }),
                 }
             );
         });
@@ -104,19 +104,19 @@ describe('Data Simple REST Client', () => {
                 'http://localhost:3000/posts/1',
                 {
                     method: 'DELETE',
-                    headers: {
+                    headers: new Headers({
                         'Content-Type': 'text/plain',
-                    },
+                    }),
                 }
             );
 
             expect(httpClient).toHaveBeenCalledWith(
                 'http://localhost:3000/posts/2',
                 {
                     method: 'DELETE',
-                    headers: {
+                    headers: new Headers({
                         'Content-Type': 'text/plain',
-                    },
+                    }),
                 }
             );
         });

packages/ra-data-simple-rest/src/index.ts

@@ -166,9 +166,9 @@ export default (
     delete: (resource, params) =>
         httpClient(`${apiUrl}/${resource}/${params.id}`, {
             method: 'DELETE',
-            headers: {
+            headers: new Headers({
                 'Content-Type': 'text/plain',
-            },
+            }),
         }).then(({ json }) => ({ data: json })),
 
     // simple-rest doesn't handle filters on DELETE route, so we fallback to calling DELETE n times instead
@@ -177,9 +177,9 @@ export default (
             params.ids.map(id =>
                 httpClient(`${apiUrl}/${resource}/${id}`, {
                     method: 'DELETE',
-                    headers: {
+                    headers: new Headers({
                         'Content-Type': 'text/plain',
-                    },
+                    }),
                 })
             )
         ).then(responses => ({