Add client version request header to api calls

src/sidebar/services/api-routes.js

@@ -14,7 +14,12 @@ function apiRoutes($http, settings) {
   let linkCache;
 
   function getJSON(url) {
-    return $http.get(url).then(({ status, data }) => {
+    const config = {
+      headers: {
+        'Hypothesis-Client-Version': '__VERSION__', // replaced by versionify
+      },
+    };
+    return $http.get(url, config).then(({ status, data }) => {
       if (status !== 200) {
         throw new Error(`Fetching ${url} failed`);
       }

src/sidebar/services/api.js

@@ -143,7 +143,9 @@ function createAPICall($http, $q, links, route, tokenGetter) {
       .then(([links, token]) => {
         const descriptor = get(links, route);
         const url = urlUtil.replaceURLParams(descriptor.url, params);
-        const headers = {};
+        const headers = {
+          'Hypothesis-Client-Version': '__VERSION__', // replaced by versionify
+        };
 
         accessToken = token;
         if (token) {