docs(response interceptor): align with nodejs default utf8 (chimurai#567)

Author: chimurai

README.md

@@ -527,7 +527,7 @@ const proxy = createProxyMiddleware({
    * Intercept response and replace 'Hello' with 'Goodbye'
    **/
   onProxyRes: responseInterceptor(async (responseBuffer, proxyRes, req, res) => {
-    const response = responseBuffer.toString('utf-8'); // convert buffer to string
+    const response = responseBuffer.toString('utf8'); // convert buffer to string
     return response.replace('Hello', 'Goodbye'); // manipulate response and return the result
   }),
 });

examples/response-interceptor/index.js

@@ -50,7 +50,7 @@ const jsonPlaceholderProxy = createProxyMiddleware({
     console.log(exchange);
 
     // log original response
-    // console.log(`[DEBUG] original response:\n${buffer.toString('utf-8')}`);
+    // console.log(`[DEBUG] original response:\n${buffer.toString('utf8')}`);
 
     // set response content-type
     res.setHeader('content-type', 'application/json; charset=utf-8');

recipes/response-interceptor.md

@@ -24,7 +24,7 @@ const proxy = createProxyMiddleware({
   onProxyRes: responseInterceptor(async (responseBuffer, proxyRes, req, res) => {
     res.statusCode = 418; // set different response status code
 
-    const response = responseBuffer.toString('utf-8');
+    const response = responseBuffer.toString('utf8');
     return response.replace('Hello', 'Teapot');
   }),
 });
@@ -45,7 +45,7 @@ const proxy = createProxyMiddleware({
     console.log(exchange); // [DEBUG] GET / -> http://www.example.com [200]
 
     // log complete response
-    const response = responseBuffer.toString('utf-8');
+    const response = responseBuffer.toString('utf8');
     console.log(response); // log response body
 
     return responseBuffer;
@@ -65,7 +65,7 @@ const proxy = createProxyMiddleware({
   onProxyRes: responseInterceptor(async (responseBuffer, proxyRes, req, res) => {
     // detect json responses
     if (proxyRes.headers['content-type'] === 'application/json') {
-      let data = JSON.parse(responseBuffer.toString('utf-8'));
+      let data = JSON.parse(responseBuffer.toString('utf8'));
 
       // manipulate JSON data here
       data = Object.assign({}, data, { extra: 'foo bar' });