http: allow url and options to be passed to http*.request and http*.get

Fixes: nodejs#20795
PR-URL: nodejs#21616
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Ron Korving <ron@ronkorving.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

doc/api/http.md

@@ -1794,15 +1794,20 @@ The `requestListener` is a function which is automatically
 added to the [`'request'`][] event.
 
 ## http.get(options[, callback])
+## http.get(url[, options][, callback])
 <!-- YAML
 added: v0.3.6
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/21616
+    description: allow both url and options to be passed to `http.get()`
   - version: v7.5.0
     pr-url: https://github.com/nodejs/node/pull/10638
     description: The `options` parameter can be a WHATWG `URL` object.
 -->
 
-* `options` {Object | string | URL} Accepts the same `options` as
+* `url` {string | URL}
+* `options` {Object} Accepts the same `options` as
   [`http.request()`][], with the `method` always set to `GET`.
   Properties that are inherited from the prototype are ignored.
 * `callback` {Function}
@@ -1866,15 +1871,20 @@ Global instance of `Agent` which is used as the default for all HTTP client
 requests.
 
 ## http.request(options[, callback])
+## http.request(url[, options][, callback])
 <!-- YAML
 added: v0.3.6
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/21616
+    description: allow both url and options to be passed to `http.request()`
   - version: v7.5.0
     pr-url: https://github.com/nodejs/node/pull/10638
     description: The `options` parameter can be a WHATWG `URL` object.
 -->
 
-* `options` {Object | string | URL}
+* `url` {string | URL}
+* `options` {Object}
   * `protocol` {string} Protocol to use. **Default:** `'http:'`.
   * `host` {string} A domain name or IP address of the server to issue the
     request to. **Default:** `'localhost'`.
@@ -1916,10 +1926,13 @@ changes:
 Node.js maintains several connections per server to make HTTP requests.
 This function allows one to transparently issue requests.
 
-`options` can be an object, a string, or a [`URL`][] object. If `options` is a
+`url` can be a string or a [`URL`][] object. If `url` is a
 string, it is automatically parsed with [`url.parse()`][]. If it is a [`URL`][]
 object, it will be automatically converted to an ordinary `options` object.
 
+If both `url` and `options` are specified, the objects are merged, with the
+`options` properties taking precedence.
+
 The optional `callback` parameter will be added as a one-time listener for
 the [`'response'`][] event.
 

doc/api/https.md

@@ -112,14 +112,19 @@ https.createServer(options, (req, res) => {
 ```
 
 ## https.get(options[, callback])
+## https.get(url[, options][, callback])
 <!-- YAML
 added: v0.3.6
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/21616
+    description: allow both url and options to be passed to `https.get()`
   - version: v7.5.0
     pr-url: https://github.com/nodejs/node/pull/10638
     description: The `options` parameter can be a WHATWG `URL` object.
 -->
-- `options` {Object | string | URL} Accepts the same `options` as
+- `url` {string | URL}
+- `options` {Object} Accepts the same `options` as
   [`https.request()`][], with the `method` always set to `GET`.
 - `callback` {Function}
 
@@ -155,17 +160,22 @@ added: v0.5.9
 Global instance of [`https.Agent`][] for all HTTPS client requests.
 
 ## https.request(options[, callback])
+## https.request(url[, options][, callback])
 <!-- YAML
 added: v0.3.6
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/21616
+    description: allow both url and options to be passed to `https.request()`
   - version: v9.3.0
     pr-url: https://github.com/nodejs/node/pull/14903
     description: The `options` parameter can now include `clientCertEngine`.
   - version: v7.5.0
     pr-url: https://github.com/nodejs/node/pull/10638
     description: The `options` parameter can be a WHATWG `URL` object.
 -->
-- `options` {Object | string | URL} Accepts all `options` from
+- `url` {string | URL}
+- `options` {Object} Accepts all `options` from
   [`http.request()`][], with some differences in default values:
   - `protocol` **Default:** `'https:'`
   - `port` **Default:** `443`

lib/_http_client.js

@@ -60,22 +60,31 @@ function validateHost(host, name) {
   return host;
 }
 
-function ClientRequest(options, cb) {
+function ClientRequest(input, options, cb) {
   OutgoingMessage.call(this);
 
-  if (typeof options === 'string') {
-    options = url.parse(options);
-    if (!options.hostname) {
+  if (typeof input === 'string') {
+    input = url.parse(input);
+    if (!input.hostname) {
       throw new ERR_INVALID_DOMAIN_NAME();
     }
-  } else if (options && options[searchParamsSymbol] &&
-             options[searchParamsSymbol][searchParamsSymbol]) {
+  } else if (input && input[searchParamsSymbol] &&
+             input[searchParamsSymbol][searchParamsSymbol]) {
     // url.URL instance
-    options = urlToOptions(options);
+    input = urlToOptions(input);
   } else {
-    options = util._extend({}, options);
+    cb = options;
+    options = input;
+    input = null;
   }
 
+  if (typeof options === 'function') {
+    cb = options;
+    options = null;
+  }
+
+  options = util._extend(input || {}, options || {});
+
   var agent = options.agent;
   var defaultAgent = options._defaultAgent || Agent.globalAgent;
   if (agent === false) {

lib/http.js

@@ -37,12 +37,12 @@ function createServer(opts, requestListener) {
   return new Server(opts, requestListener);
 }
 
-function request(options, cb) {
-  return new ClientRequest(options, cb);
+function request(url, options, cb) {
+  return new ClientRequest(url, options, cb);
 }
 
-function get(options, cb) {
-  var req = request(options, cb);
+function get(url, options, cb) {
+  var req = request(url, options, cb);
   req.end();
   return req;
 }

test/parallel/test-http-request-arguments.js

@@ -0,0 +1,28 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const http = require('http');
+
+// Test providing both a url and options, with the options partially
+// replacing address and port portions of the URL provided.
+{
+  const server = http.createServer(
+    common.mustCall((req, res) => {
+      assert.strictEqual(req.url, '/testpath');
+      res.end();
+      server.close();
+    })
+  );
+  server.listen(
+    0,
+    common.mustCall(() => {
+      http.get(
+        'http://example.com/testpath',
+        { hostname: 'localhost', port: server.address().port },
+        common.mustCall((res) => {
+          res.resume();
+        })
+      );
+    })
+  );
+}