Process 100, 102-199 status codes according to specs.

doc/api/http.md

@@ -417,7 +417,7 @@ const options = {
   path: '/length_request'
 };
 
-// make a request
+// Make a request
 const req = http.request(options);
 req.end();
 

lib/_http_client.js

@@ -459,7 +459,6 @@ function socketOnData(d) {
   }
 }
 
-// client
 function statusIsInformational(status) {
   // 100 (Continue)    RFC7231 Section 6.2.1
   // 102 (Processing)  RFC2518
@@ -496,14 +495,6 @@ function parserOnIncomingClient(res, shouldKeepAlive) {
     return 2;  // Skip body and treat as Upgrade.
   }
 
-  // Responses to HEAD requests are crazy.
-  // HEAD responses aren't allowed to have an entity-body
-  // but *can* have a content-length which actually corresponds
-  // to the content-length of the entity-body had the request
-  // been a GET.
-  var isHeadResponse = req.method === 'HEAD';
-  debug('AGENT isHeadResponse', isHeadResponse);
-
   if (statusIsInformational(res.statusCode)) {
     // Restart the parser, as this is a 1xx informational message.
     req.res = null; // Clear res so that we don't hit double-responses.

test/parallel/test-http-information-processing.js

@@ -1,10 +1,11 @@
 'use strict';
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const http = require('http');
+const Countdown = require('../common/countdown');
 
 const test_res_body = 'other stuff!\n';
-let processing_count = 0;
+const countdown = new Countdown(3, common.mustCall(() => server.close()));
 
 const server = http.createServer((req, res) => {
   console.error('Server sending informational message #1...');
@@ -31,21 +32,21 @@ server.listen(0, function() {
 
   req.on('information', function(res) {
     console.error('Client got 102 Processing...');
-    processing_count++;
+    countdown.dec();
   });
 
   req.on('response', function(res) {
-    assert.strictEqual(processing_count, 2,
+    assert.strictEqual(countdown.remaining, 1,
                        'Full response received before all 102 Processing');
     assert.strictEqual(200, res.statusCode,
                        `Final status code was ${res.statusCode}, not 200.`);
     res.setEncoding('utf8');
     res.on('data', function(chunk) { body += chunk; });
     res.on('end', function() {
       console.error('Got full response.');
-      assert.strictEqual(body, test_res_body, 'Response body doesn\'t match.');
-      assert.ok('abcd' in res.headers, 'Response headers missing.');
-      server.close();
+      assert.strictEqual(body, test_res_body);
+      assert.ok('abcd' in res.headers);
+      countdown.dec();
     });
   });
 });