lib: noproxy support, match proxy detection to request

PR-URL: https://github.com/nodejs/node-gyp/pull/1978
Reviewed-By: Rod Vagg <rod@vagg.org>

test/test-download.js

@@ -90,6 +90,101 @@ test('download over https with custom ca', function (t) {
   })
 })
 
+test('download over http with proxy', function (t) {
+  t.plan(2)
+
+  var server = http.createServer(function (req, res) {
+    t.strictEqual(req.headers['user-agent'],
+      'node-gyp v42 (node ' + process.version + ')')
+    res.end('ok')
+    pserver.close(function () {
+      server.close()
+    })
+  })
+
+  var pserver = http.createServer(function (req, res) {
+    t.strictEqual(req.headers['user-agent'],
+      'node-gyp v42 (node ' + process.version + ')')
+    res.end('proxy ok')
+    server.close(function () {
+      pserver.close()
+    })
+  })
+
+  var host = 'localhost'
+  server.listen(0, host, function () {
+    var port = this.address().port
+    pserver.listen(port + 1, host, function () {
+      var gyp = {
+        opts: {
+          proxy: 'http://' + host + ':' + (port + 1)
+        },
+        version: '42'
+      }
+      var url = 'http://' + host + ':' + port
+      var req = install.test.download(gyp, {}, url)
+      req.on('response', function (res) {
+        var body = ''
+        res.setEncoding('utf8')
+        res.on('data', function (data) {
+          body += data
+        })
+        res.on('end', function () {
+          t.strictEqual(body, 'proxy ok')
+        })
+      })
+    })
+  })
+})
+
+test('download over http with noproxy', function (t) {
+  t.plan(2)
+
+  var server = http.createServer(function (req, res) {
+    t.strictEqual(req.headers['user-agent'],
+      'node-gyp v42 (node ' + process.version + ')')
+    res.end('ok')
+    pserver.close(function () {
+      server.close()
+    })
+  })
+
+  var pserver = http.createServer(function (req, res) {
+    t.strictEqual(req.headers['user-agent'],
+      'node-gyp v42 (node ' + process.version + ')')
+    res.end('proxy ok')
+    server.close(function () {
+      pserver.close()
+    })
+  })
+
+  var host = 'localhost'
+  server.listen(0, host, function () {
+    var port = this.address().port
+    pserver.listen(port + 1, host, function () {
+      var gyp = {
+        opts: {
+          proxy: 'http://' + host + ':' + (port + 1),
+          noproxy: 'localhost'
+        },
+        version: '42'
+      }
+      var url = 'http://' + host + ':' + port
+      var req = install.test.download(gyp, {}, url)
+      req.on('response', function (res) {
+        var body = ''
+        res.setEncoding('utf8')
+        res.on('data', function (data) {
+          body += data
+        })
+        res.on('end', function () {
+          t.strictEqual(body, 'ok')
+        })
+      })
+    })
+  })
+})
+
 test('download with missing cafile', function (t) {
   t.plan(1)
   var gyp = {