Merge branch '216731-fix-fetching-author-under-relativeurl' into 'master'

Fix #216731 "Fetching author API under relative url"

Closes #216731

See merge request gitlab-org/gitlab!32379

app/assets/javascripts/projects/commits/store/actions.js

@@ -3,6 +3,7 @@ import * as types from './mutation_types';
 import axios from '~/lib/utils/axios_utils';
 import createFlash from '~/flash';
 import { __ } from '~/locale';
+import { joinPaths } from '~/lib/utils/url_utility';
 
 export default {
   setInitialData({ commit }, data) {
@@ -16,10 +17,8 @@ export default {
   },
   fetchAuthors({ dispatch, state }, author = null) {
     const { projectId } = state;
-    const path = '/autocomplete/users.json';
-
     return axios
-      .get(path, {
+      .get(joinPaths(gon.relative_url_root || '', '/autocomplete/users.json'), {
         params: {
           project_id: projectId,
           active: true,