fix(server): clean up vestigial code from proxy (#3640)

When using the proxy feature of Karma, the target value can include the [scheme](https://tools.ietf.org/html/std66#section-3.1). It was used to determine the `https` variable to be sent to the [`http-proxy`](https://www.npmjs.com/package/http-proxy) `.createProxyServer` method. However, it is now disregarded by that package. This change cleans it up.

Author: Jonathan Ginsburg

lib/middleware/proxy.js

@@ -34,20 +34,16 @@ function parseProxyConfig (proxies, config) {
 
     const hostname = proxyDetails.hostname || config.hostname
     const protocol = proxyDetails.protocol || config.protocol
-    const https = proxyDetails.protocol === 'https:'
-    let port
-    if (proxyDetails.port) {
-      port = proxyDetails.port
-    } else if (proxyDetails.protocol) {
-      port = https ? '443' : '80'
-    } else {
-      port = config.port
+    const defaultPorts = {
+      'http:': '80',
+      'https:': '443'
     }
+    const port = proxyDetails.port || defaultPorts[proxyDetails.protocol] || config.port
     const changeOrigin = proxyConfiguration.changeOrigin || false
-    const Agent = https ? httpsAgent : httpAgent
+    const Agent = protocol === 'https:' ? httpsAgent : httpAgent
     const agent = new Agent({ keepAlive: true })
     const proxy = httpProxy.createProxyServer({
-      target: { host: hostname, port, https, protocol },
+      target: { host: hostname, port, protocol },
       xfwd: true,
       changeOrigin: changeOrigin,
       secure: config.proxyValidateSSL,
@@ -71,7 +67,7 @@ function parseProxyConfig (proxies, config) {
       res.destroy()
     })
 
-    return { path: proxyPath, baseUrl: pathname, host: hostname, port, https, proxy, agent }
+    return { path: proxyPath, baseUrl: pathname, host: hostname, port, proxy, agent }
   }), 'path').reverse()
 }
 

test/unit/middleware/proxy.spec.js

@@ -146,10 +146,16 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: '8000',
       baseUrl: '/',
-      path: '/base/',
-      https: false
+      path: '/base/'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
+    expect(parsedProxyConfig[0].proxy).to.containSubset({
+      options: {
+        target: {
+          protocol: 'http:'
+        }
+      }
+    })
   })
 
   it('should set default http port', () => {
@@ -160,10 +166,16 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: '80',
       baseUrl: '/',
-      path: '/base/',
-      https: false
+      path: '/base/'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
+    expect(parsedProxyConfig[0].proxy).to.containSubset({
+      options: {
+        target: {
+          protocol: 'http:'
+        }
+      }
+    })
   })
 
   it('should set default https port', () => {
@@ -174,8 +186,7 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: '443',
       baseUrl: '/',
-      path: '/base/',
-      https: true
+      path: '/base/'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
     expect(parsedProxyConfig[0].proxy).to.containSubset({
@@ -195,10 +206,16 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: '8000',
       baseUrl: '/proxy',
-      path: '/base',
-      https: false
+      path: '/base'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
+    expect(parsedProxyConfig[0].proxy).to.containSubset({
+      options: {
+        target: {
+          protocol: 'http:'
+        }
+      }
+    })
   })
 
   it('should determine protocol', () => {
@@ -209,8 +226,7 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: '8000',
       baseUrl: '',
-      path: '/base',
-      https: true
+      path: '/base'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
     expect(parsedProxyConfig[0].proxy).to.containSubset({
@@ -231,8 +247,7 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: 9877,
       baseUrl: '/proxy/test',
-      path: '/base',
-      https: false
+      path: '/base'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
   })
@@ -246,8 +261,7 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: 9877,
       baseUrl: '/proxy/test/',
-      path: '/base/',
-      https: false
+      path: '/base/'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
   })
@@ -261,8 +275,7 @@ describe('middleware.proxy', () => {
       host: 'krinkle.dev',
       port: '80',
       baseUrl: '/w',
-      path: '/w',
-      https: false
+      path: '/w'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
   })
@@ -276,8 +289,7 @@ describe('middleware.proxy', () => {
       host: 'krinkle.dev',
       port: '443',
       baseUrl: '/w',
-      path: '/w',
-      https: true
+      path: '/w'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
   })
@@ -290,8 +302,7 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: '8000',
       baseUrl: '/proxy/test/',
-      path: '/base/',
-      https: false
+      path: '/base/'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
   })
@@ -307,16 +318,14 @@ describe('middleware.proxy', () => {
       host: 'gstatic.com',
       port: '80',
       baseUrl: '/something',
-      path: '/sub/some',
-      https: false
+      path: '/sub/some'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
     expect(parsedProxyConfig[1]).to.containSubset({
       host: 'localhost',
       port: '9000',
       baseUrl: '',
-      path: '/sub',
-      https: false
+      path: '/sub'
     })
     expect(parsedProxyConfig[1].proxy).to.exist
   })
@@ -331,8 +340,7 @@ describe('middleware.proxy', () => {
       host: 'localhost',
       port: '8000',
       baseUrl: '/',
-      path: '/base/',
-      https: false
+      path: '/base/'
     })
     expect(parsedProxyConfig[0].proxy).to.exist
   })