fix(v2): make sure non default baseUrl works on build & dev (#1414)

* fix non default baseUrl not working for client

* fix website build for non defautl baseurl

* optimize

* remove console log

packages/docusaurus/lib/commands/start.js

@@ -127,7 +127,7 @@ module.exports = async function start(siteDir, cliOptions = {}) {
       ignored: /node_modules/,
     },
     historyApiFallback: {
-      rewrites: [{from: /\.html$/, to: '/'}],
+      rewrites: [{from: /\/*/, to: baseUrl}],
     },
     disableHostCheck: true,
     // Enable overlay on browser. E.g: display errors

packages/docusaurus/lib/webpack/server.js

@@ -18,6 +18,9 @@ module.exports = function createServerConfig(props) {
   const config = createBaseConfig(props, true);
   const isProd = process.env.NODE_ENV === 'production';
 
+  const routesRelativePaths = routesPaths.map(str =>
+    baseUrl === '/' ? str : str.replace(new RegExp(`^${baseUrl}`), '/'),
+  );
   const serverConfig = merge(config, {
     entry: {
       main: path.resolve(__dirname, '../client/serverEntry.js'),
@@ -44,7 +47,7 @@ module.exports = function createServerConfig(props) {
           baseUrl,
           outDir,
         },
-        paths: routesPaths,
+        paths: routesRelativePaths,
       }),
 
       // Show compilation progress bar.