How to use createProxyServer method in Appium Base Driver

...24}25test('proxy request GET', (t) => {26  t.plan(2)27  const server = createOrigin()28  const proxyServer = createProxyServer(8888)29  const req = proxy({30    hostname: 'localhost',31    port: 9090,32    method: 'GET',33    proxy: {34      hostname: 'localhost',35      port: 8888,36      method: 'GET'37    }38  }, (res) => {39    var data = ''40    var cnt = 041    res.on('data', (chunk) => {42      data += chunk43      cnt++44    })45    res.on('end', () => {46      t.equal(cnt, 10, 'received in 10 chunks')47      t.equal(data, '12345678910', 'correct final response')48      server.close()49      proxyServer.close()50    })51  })52  req.end()53})54test('proxy request GET as a queryparameter', (t) => {55  t.plan(2)56  const server = createOrigin()57  const proxyServer = createProxyServer(8888)58  const req = http.request({59    hostname: 'localhost',60    port: 8888,61    method: 'GET',62    path: '/?proxy=http://localhost:9090'63  }, (res) => {64    var data = ''65    var cnt = 066    res.on('data', (chunk) => {67      data += chunk68      cnt++69    })70    res.on('end', () => {71      t.equal(cnt, 10, 'received in 10 chunks')72      t.equal(data, '12345678910', 'correct final response')73      server.close()74      proxyServer.close()75    })76  })77  req.end()78})79test('proxy request GET in path', (t) => {80  t.plan(2)81  const server = createOrigin()82  const proxyServer = createProxyServer(8888)83  const req = http.request({84    hostname: 'localhost',85    port: 8888,86    method: 'GET',87    path: '/proxy=' + encodeURIComponent('http://localhost:9090')88  }, (res) => {89    var data = ''90    var cnt = 091    res.on('data', (chunk) => {92      data += chunk93      cnt++94    })95    res.on('end', () => {96      t.equal(cnt, 10, 'received in 10 chunks')97      t.equal(data, '12345678910', 'correct final response')98      server.close()99      proxyServer.close()100    })101  })102  req.end()103})104test('proxy request GET in path + cache buster', (t) => {105  t.plan(2)106  const server = createOrigin()107  const proxyServer = createProxyServer(8888)108  const req = http.request({109    hostname: 'localhost',110    port: 8888,111    method: 'GET',112    path: '/1.1.9PLOY_ENV%3Dstaging/proxy=' + encodeURIComponent('http://localhost:9090')113  }, (res) => {114    var data = ''115    var cnt = 0116    res.on('data', (chunk) => {117      data += chunk118      cnt++119    })120    res.on('end', () => {121      t.equal(cnt, 10, 'received in 10 chunks')122      t.equal(data, '12345678910', 'correct final response')123      server.close()124      proxyServer.close()125    })126  })127  req.end()128})129test('proxy request GET as a queryparameter enhance request handler', (t) => {130  t.plan(2)131  const server = createOrigin()132  const proxyServer = createProxyServer(8888, false, (req) => {133    req.url = req.url.replace('something', 'http://localhost:9090')134  })135  const req = http.request({136    hostname: 'localhost',137    port: 8888,138    method: 'GET',139    path: '/?proxy=something'140  }, (res) => {141    var data = ''142    var cnt = 0143    res.on('data', (chunk) => {144      data += chunk145      cnt++146    })147    res.on('end', () => {148      t.equal(cnt, 10, 'received in 10 chunks')149      t.equal(data, '12345678910', 'correct final response')150      server.close()151      proxyServer.close()152    })153  })154  req.end()155})156test('proxy request GET as a queryparameter enhance request handler, block response', (t) => {157  t.plan(1)158  const server = createOrigin()159  const proxyServer = createProxyServer(8888, false, (req, res) => {160    return res.end('yo wrong')161  })162  const req = http.request({163    hostname: 'localhost',164    port: 8888,165    method: 'GET',166    path: '/?proxy=something'167  }, (res) => {168    var data = ''169    res.on('data', (chunk) => {170      data += chunk171    })172    res.on('end', () => {173      t.equal(data, 'yo wrong', 'correct response')174      server.close()175      proxyServer.close()176    })177  })178  req.end()179})180test('proxy request GET as a queryparameter enhance request handler, return a promise', (t) => {181  t.plan(2)182  const server = createOrigin()183  const proxyServer = createProxyServer(8888, false, (req) => {184    req.url = req.url.replace('something', 'http://localhost:9090')185    return new Promise((resolve, reject) => {186      setTimeout(resolve, 100)187    })188  })189  const req = http.request({190    hostname: 'localhost',191    port: 8888,192    method: 'GET',193    path: '/?proxy=something'194  }, (res) => {195    var data = ''196    var cnt = 0197    res.on('data', (chunk) => {198      data += chunk199      cnt++200    })201    res.on('end', () => {202      t.equal(cnt, 10, 'received in 10 chunks')203      t.equal(data, '12345678910', 'correct final response')204      server.close()205      proxyServer.close()206    })207  })208  req.end()209})210test('proxy request GET as a queryparameter enhance request handler, block response using a promise', (t) => {211  t.plan(1)212  const server = createOrigin()213  const proxyServer = createProxyServer(8888, false, (req, res) => {214    return new Promise((resolve, reject) => {215      setTimeout(() => {216        resolve(res.end('yo wrong'))217      }, 100)218    })219  })220  const req = http.request({221    hostname: 'localhost',222    port: 8888,223    method: 'GET',224    path: '/?proxy=something'225  }, (res) => {226    var data = ''227    res.on('data', (chunk) => {228      data += chunk229    })230    res.on('end', () => {231      t.equal(data, 'yo wrong', 'correct response')232      server.close()233      proxyServer.close()234    })235  })236  req.end()237})238test('proxy request GET as qeuryparam with json', (t) => {239  t.plan(2)240  const server = createOrigin()241  const proxyServer = createProxyServer(8888)242  const req = http.request({243    hostname: 'localhost',244    port: 8888,245    method: 'GET',246    path: '/?proxy={"host":"localhost","port":"9090"}'247  }, (res) => {248    var data = ''249    var cnt = 0250    res.on('data', (chunk) => {251      data += chunk252      cnt++253    })254    res.on('end', () => {255      t.equal(cnt, 10, 'received in 10 chunks')256      t.equal(data, '12345678910', 'correct final response')257      server.close()258      proxyServer.close()259    })260  })261  req.end()262})263test('proxy request GET as qeuryparam with wrong json - error', (t) => {264  t.plan(1)265  const server = createOrigin()266  const proxyServer = createProxyServer(8888)267  const req = http.request({268    hostname: 'localhost',269    port: 8888,270    method: 'GET',271    path: '/?proxy={haha}'272  }, (res) => {273    var data = ''274    res.on('data', (chunk) => {275      data += chunk276    })277    res.on('end', () => {278      t.equal(data, 'wrong json: {haha}', 'correct error message')279      server.close()280      proxyServer.close()281    })282  })283  req.end()284})285test('proxy request POST', (t) => {286  t.plan(4)287  const server = createOrigin()288  const proxyServer = createProxyServer(8888, false, false, () => {289    t.ok(true, 'fires proxy middleware')290  })291  const req = proxy({292    hostname: 'localhost',293    port: 9090,294    method: 'POST',295    proxy: {296      hostname: 'localhost',297      port: 8888,298      method: 'POST'299    }300  }, (res) => {301    var data = ''302    var cnt = 0303    res.on('data', (c) => {304      data += c305      cnt++306    })307    res.on('end', () => {308      t.equal(res.headers.hello, 'haha', 'correct headers from origin get passed')309      t.equal(cnt, 10, 'received in 10 chunks')310      t.equal(data, '1!2!3!4!5!6!7!8!9!10!', 'correct final response, recieves payload')311      server.close()312      proxyServer.close()313    })314  })315  req.write('!')316  req.end()317})318test('proxy request statusCode response', (t) => {319  t.plan(2)320  const statusCode = 500321  const statusMessage = 'nasty server error'322  const server = createOrigin(statusCode, statusMessage)323  const proxyServer = createProxyServer(8888)324  const req = proxy({325    hostname: 'localhost',326    port: 9090,327    method: 'GET',328    proxy: {329      hostname: 'localhost',330      port: 8888,331      method: 'GET'332    }333  }, (res) => {334    t.equal(res.statusCode, 500, 'proxy should forward the statusCode')335    t.equal(res.statusMessage, 'nasty server error')336    server.close()337    proxyServer.close()338  })339  req.end()340})341test('proxy request error forwarding', (t) => {342  t.plan(3)343  const server = createOrigin()344  const proxyServer = createProxyServer(8888)345  const errorReq = proxy({346    hostname: 'weirdurl.weirdness',347    port: 9090,348    method: 'POST',349    proxy: {350      hostname: 'localhost',351      port: 8888,352      method: 'POST'353    }354  }, (res) => {355    var data = ''356    res.on('data', (c) => {357      data += c358    })359    res.on('end', () => {360      t.equal(res.statusCode, 500, '500 statuscode')361      t.same(362        JSON.parse(res.statusMessage),363        {364          error: 'getaddrinfo ENOTFOUND weirdurl.weirdness weirdurl.weirdness:9090',365          options: {366            hostname: 'weirdurl.weirdness',367            port: 9090,368            method: 'POST'369          }370        },371        'correct errorMessage'372      )373      t.equal(data, '', 'empty response on error')374      server.close()375      proxyServer.close()376    })377  })378  errorReq.end()379})380test('proxy request error forwarding', (t) => {381  t.plan(1)382  const proxyServer = createProxyServer(8888)383  http.request({384    hostname: 'localhost',385    port: 8888386  }, (res) => {387    var str = ''388    res.on('data', (chunk) => { str += chunk })389    res.on('end', () => {390      t.equal(str, 'minimal-http-proxy ' + pckg.version, 'return minimal-http-proxy on normal requests')391      proxyServer.close()392    })393  }).end()394})395test('proxy request over https', (t) => {396  t.plan(1)397  const req = proxy({398    hostname: 'google.com',399    protocol: 'https',400    method: 'GET',401    proxy: {402      hostname: 'proxy.vigour.io',403      method: 'POST',404      protocol: 'https',405      path: '/?random=true'406    }407  }, (res) => {408    var str = ''409    res.on('data', (chunk) => { str += chunk })410    res.on('end', () => {411      t.equal(!!str, true, 'returns data')412    })413  })414  req.end()415})416test('proxy request over https using qeuryparam', (t) => {417  t.plan(1)418  const proxyServer = createProxyServer(8888)419  const req = http.request({420    hostname: 'localhost',421    port: 8888,422    method: 'GET',423    path: '/?proxy=https://google.com'424  }, (res) => {425    var str = ''426    res.on('data', (chunk) => { str += chunk })427    res.on('end', () => {428      t.equal(!!str, true, 'returns data')429      proxyServer.close()430    })431  })432  req.end()...

...4 * Creates the proxy server.5 *6 * Examples:7 *8 *    httpProxy.createProxyServer({ .. }, 8000)9 *    // => '{ web: [Function], ws: [Function] ... }'10 *11 * @param {Object} Options Config object passed to the proxy12 *13 * @return {Object} Proxy Proxy object with handlers for `ws` and `web` requests14 *15 * @api public16 */17function createProxyServer(options) {18  /*19   *  `options` is needed and it must have the following layout:20   *21   *  {22   *    target : <url string to be parsed with the url module>23   *    forward: <url string to be parsed with the url module>24   *    agent  : <object to be passed to http(s).request>25   *    ssl    : <object to be passed to https.createServer()>26   *    ws     : <true/false, if you want to proxy websockets>27   *    xfwd   : <true/false, adds x-forward headers>28   *    secure : <true/false, verify SSL certificate>29   *    toProxy: <true/false, explicitly specify if we are proxying to another proxy>30   *    prependPath: <true/false, Default: true - specify whether you want to prepend the target's path to the proxy path>31   *    ignorePath: <true/false, Default: false - specify whether you want to ignore the proxy path of the incoming request>...