fix pagination component handling different header styles from different server proxies

app/assets/javascripts/vue_pipelines_index/store.js.es6

@@ -3,14 +3,24 @@
 /*= require vue_realtime_listener/index.js */
 ((gl) => {
-  const pageValues = headers => ({
-    perPage: +headers['X-Per-Page'],
-    page: +headers['X-Page'],
-    total: +headers['X-Total'],
-    totalPages: +headers['X-Total-Pages'],
-    nextPage: +headers['X-Next-Page'],
-    previousPage: +headers['X-Prev-Page'],
-  });
+  const pageValues = (headers) => {
+    const normalizedHeaders = {};
+
+    Object.keys(headers).forEach((e) => {
+      normalizedHeaders[e.toUpperCase()] = headers[e];
+    });
+
+    const paginationInfo = {
+      perPage: +normalizedHeaders['X-PER-PAGE'],
+      page: +normalizedHeaders['X-PAGE'],
+      total: +normalizedHeaders['X-TOTAL'],
+      totalPages: +normalizedHeaders['X-TOTAL-PAGES'],
+      nextPage: +normalizedHeaders['X-NEXT-PAGE'],
+      previousPage: +normalizedHeaders['X-PREV-PAGE'],
+    };
+
+    return paginationInfo;
+  };
   gl.PipelineStore = class {
     fetchDataLoop(Vue, pageNum, url, apiScope) {