diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 823aa1d..5bc7fd4 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -6,7 +6,7 @@
 # Pull Request Details
 
 ## Related Issue
-Please, open a issue before a pull request. It will help in understanding better the PR aim.
+Please, open an issue before a pull request. It will help in understanding better the PR aim.
 
 ## Types of changes
 <!-- Put an `x` in all the boxes that apply -->
@@ -19,8 +19,7 @@ Please, open a issue before a pull request. It will help in understanding better
 <!-- Go over all the following points, and put an `x` in all the boxes that apply. -->
 <!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
 - [ ] My code follows the code style of this project.
-- [ ] My change requires a change to the documentation.
-- [ ] I have updated the documentation accordingly.
+- [ ] I have updated the documentation or my changes dont require it.
 - [ ] I have read the [CONTRIBUTING](CONTRIBUTING.md) document.
-- [ ] I have added tests to cover my changes (or the exist one were enough).
+- [ ] I have added tests to cover my changes (or the existing one were enough).
 - [ ] All new and existing tests passed.
diff --git a/.gitignore b/.gitignore
index a06b3b6..d380b6e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,15 +1,10 @@
 # MacOS
 .DS_STORE
 
-# IDEs
-.idea
-*.iml
-
-# Node & npm
+# Node, npm & CI
 node_modules
 coverage
 .nyc_output
 
-# Certificates
-cert/localhost.*
-cert/mkcert-*
\ No newline at end of file
+# Build
+build
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 35cfabe..329ce61 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,5 +6,5 @@ language: node_js
 node_js:
 - node
 - 10
-- 7.6
+- 8
 after_success: npm run coveralls
diff --git a/README.md b/README.md
index 13f2644..8a14114 100644
--- a/README.md
+++ b/README.md
@@ -12,16 +12,32 @@ It works with MacOS, Linux and Windows, on Chrome and Firefox, and requires you
 [![Known Vulnerabilities](https://snyk.io/test/npm/https-localhost/badge.svg)](https://snyk.io/test/npm/https-localhost)
 [![GitHub issues](https://img.shields.io/github/issues/daquinoaldo/https-localhost.svg)](https://github.com/daquinoaldo/https-localhost/issues)
 
+
 ## Install and use standalone
 ```
-npm i -g https-localhost
+npm i -g --only=prod https-localhost
 ```
 ```
 serve ~/myproj
 ```
 - `sudo` may be necessary.
 - If a static path is not provided the current directory content will be served.
-- You can change the port setting the PORT environmental variable: `PORT=4433 serve ~/myproj`.
+- You can change the **port** setting the `PORT` environmental variable: `PORT=4433 serve ~/myproj`. Specifying port number will also prevent http to https redirect.
+
+### Binaries
+If you don't have Node.js installed just use a packaged version! Download it from the [release page](https://github.com/daquinoaldo/https-localhost/releases).
+```
+// Linux
+./https-localhost-linux ~/myproj
+
+// MacOS
+./https-localhost-macos ~/myproj
+
+// Windows
+./https-localhost-win.exe C:\User\me\myproj
+```
+**Tip 1:** on Windows just drag the folder on the executable to serve itV.  
+**Tip 2:** on all platform put the executable on the folder you want to serve and double-click it.
 
 
 ## Use as module
@@ -36,9 +52,13 @@ const app = httpLocalhost()
 // app is an express app, do what you usually do with express
 app.listen(port)
 ```
-- If the port number is not provided, it will listen on 443.
-- To redirect the http traffic to https use `app.redirect()`.
-- You can serve static files with `app.serve(path)`.
+- If the **port** number is not provided, it will listen on 443.
+- To **redirect** the http traffic to https use `app.redirect()`.
+- You can serve **static files** with `app.serve(path)`.
+
+**Tip:** consider installing it as a dev dependency: this is not a production tool!  
+`npm i --save-dev https-localhost`
+
 
 ## Production
 This tool has a production version that activates **HTTP/2**, **compression** and **minify**.
@@ -49,6 +69,7 @@ I decide to not activate it by default since it is usually an unwanted behaviour
 
 **IMPORTANT**: the fact that there is a production enviornment doesn't mean that this tool is suitable for production. It's intended to be used only for local testing.
 
+
 ## Why and how it works
 Serving static content on localhost in a trusted SSL connection is not so simple.  
 It requires to manually generate and trust certificates, with complicate commands and many manual steps.
@@ -76,9 +97,19 @@ Checkout the updated list [here](https://github.com/FiloSottile/mkcert/blob/mast
 
 ## Troubleshooting
 ### Node.js version
-https-localhost requires Node.js 7.6 or higher.  
+https-localhost requires Node.js 8 or higher.  
 <sub>If you need compatibility with previously Node.js versions let me know, I'll try to rearrange the code.</sub>
 
+### root required
+-  **At first run** this tool generate a trusted certificate. The sudo password may be required. If you cannot provide the sudo password generate a `localhost.key` and `localhost.crt` and specify its path with `CERT_PATH=/diractory/containing/certificates/ serve ~/myproj`.
+- **At each run** the password may be required to run the server on port 443 and 80. To avoid the script ask for password specify a different port number: `PORT=4433 serve ~/myproj`.
+
+### EACCES
+Run with sudo to use the default ports 443 and 80. You can also change port with: `PORT=4433 serve ~/myproj`.
+
+### EADDRINUSE
+Another service on your machine is using port 443 or port 80. Stop it or change port with `PORT=4433 serve ~/myproj`.
+
 ### RangeError
 ```
 RangeError: Invalid typed array length: -4095
@@ -89,6 +120,12 @@ It should be present only with `NODE_ENV=production`, hence the easiest fix is t
 
 I've tried to reproduce this error without any success (checkout the [Travis build logs](https://travis-ci.org/daquinoaldo/https-localhost)). If you can help please open an issue and describe as better as you can how to reproduce it, I'll be happy to help you.
 
+
+## Contributing
+Each contribute is welcome!  
+Please, checkout the [contributing guidelines](.github/CONTRIBUTING.md).
+
+
 ## License
 Is released under [AGPL-3.0 - GNU Affero General Public License v3.0](LICENSE).
 
diff --git a/cert/generate.js b/cert/generate.js
deleted file mode 100644
index 743f93a..0000000
--- a/cert/generate.js
+++ /dev/null
@@ -1,85 +0,0 @@
-#!/usr/bin/env node
-
-const exec = require("child_process").exec
-const fs = require("fs")
-const https = require("https")
-
-const MKCERT_VERSION = "v1.3.0"
-
-// get the executable name
-function getExe() {
-  /* istanbul ignore next: tested on all platform on travis */
-  switch (process.platform) {
-    case "darwin":
-      return "mkcert-" + MKCERT_VERSION + "-darwin-amd64"
-    case "linux":
-      return "mkcert-" + MKCERT_VERSION + "-linux-amd64"
-    case "win32":
-      return "mkcert-" + MKCERT_VERSION + "-windows-amd64.exe"
-    default:
-      console.warn("Cannot generate the localhost certificate on your " +
-        "platform. Please, consider contacting the developer if you can help.")
-      process.exit(0)
-  }
-}
-
-// download a binary file
-function download(url, path) {
-  console.log("Downloading the mkcert executable...")
-  const file = fs.createWriteStream(path)
-  return new Promise(resolve => {
-    function get(url, file) {
-      https.get(url, (response) => {
-        if (response.statusCode === 302) get(response.headers.location, file)
-        else response.pipe(file).on("finish", resolve)
-      })
-    }
-    get(url, file)
-  })
-}
-
-// execute the binary executable to generate the certificates
-function mkcert(path, exe) {
-  return new Promise((resolve, reject) => {
-    console.log("Running mkcert to generate certificates...")
-    exec(path + exe + " -install -cert-file " + path + "localhost.crt " +
-    "-key-file " + path + "localhost.key localhost", (err, stdout, stderr) => {
-      console.log(stdout)
-      console.error(stderr)
-      /* istanbul ignore if: cannot be tested */
-      if (err) reject(err)
-      resolve()
-    })
-  })
-}
-
-async function main() {
-  console.info("Generating certificates...")
-  const path = "cert" + /* istanbul ignore next: cannot be tested */
-    (process.platform === "win32" ? "\\" : "/")
-  // Check if files already exists
-  if (fs.existsSync(path + "localhost.crt") &&
-    /* istanbul ignore next: not relevant */
-    fs.existsSync(path + "localhost.key")) {
-    console.info("Certificates already exists. Skip.")
-    return
-  }
-  const url = "https://github.com/FiloSottile/mkcert/releases/download/" +
-    MKCERT_VERSION + "/"
-  const exe = getExe()
-  // download the executable
-  await download(url + exe, path + exe)
-  // make binary executable
-  fs.chmodSync(path + exe, "0755")
-  // execute the binary
-  await mkcert(path, exe)
-  console.log("Certificates generated, installed and trusted. Ready to go!")
-}
-
-// run as script
-/* istanbul ignore if: cannot be tested */
-if (require.main === module)
-  try { main() } catch (err) { console.error("\nExec error: " + err) }
-
-// export as module
-module.exports = main
diff --git a/certs.js b/certs.js
new file mode 100644
index 0000000..927f50f
--- /dev/null
+++ b/certs.js
@@ -0,0 +1,140 @@
+#!/usr/bin/env node
+
+const path = require("path")
+const fs = require("fs")
+const exec = require("child_process").exec
+const https = require("https")
+const getAppDataPath = require("appdata-path")
+
+const MKCERT_VERSION = "v1.3.0"
+const CERT_PATH = getAppDataPath("https-localhost")
+
+// get the executable name
+function getExe() {
+  /* istanbul ignore next: tested on all platform on travis */
+  switch (process.platform) {
+    case "darwin":
+      return "mkcert-" + MKCERT_VERSION + "-darwin-amd64"
+    case "linux":
+      return "mkcert-" + MKCERT_VERSION + "-linux-amd64"
+    case "win32":
+      return "mkcert-" + MKCERT_VERSION + "-windows-amd64.exe"
+    default:
+      console.warn("Cannot generate the localhost certificate on your " +
+        "platform. Please, consider contacting the developer if you can help.")
+      process.exit(0)
+  }
+}
+
+// download a binary file
+function download(url, path) {
+  console.log("Downloading the mkcert executable...")
+  const file = fs.createWriteStream(path)
+  return new Promise(resolve => {
+    function get(url, file) {
+      https.get(url, (response) => {
+        if (response.statusCode === 302) get(response.headers.location, file)
+        else response.pipe(file).on("finish", resolve)
+      })
+    }
+    get(url, file)
+  })
+}
+
+// execute the binary executable to generate the certificates
+function mkcert(appDataPath, exe) {
+  const logPath = path.join(appDataPath, "mkcert.log")
+  const errPath = path.join(appDataPath, "mkcert.err")
+  // escape spaces in appDataPath (Mac OS)
+  appDataPath = appDataPath.replace(" ", "\\ ")
+  const exePath = path.join(appDataPath, exe)
+  const crtPath = path.join(appDataPath, "localhost.crt")
+  const keyPath = path.join(appDataPath, "localhost.key")
+  const cmd = exePath + " -install -cert-file " + crtPath +
+    " -key-file " + keyPath + " localhost"
+  return new Promise((resolve, reject) => {
+    console.log("Running mkcert to generate certificates...")
+    exec(cmd, (err, stdout, stderr) => {
+      // log
+      const errFun = err => {
+        /* istanbul ignore if: cannot be tested */
+        if (err) console.error(err)
+      }
+      fs.writeFile(logPath, stdout, errFun)
+      fs.writeFile(errPath, stderr, errFun)
+      /* istanbul ignore if: cannot be tested */
+      if (err) reject(err)
+      resolve()
+    })
+  })
+}
+
+async function generate(appDataPath = CERT_PATH) {
+  console.info("Generating certificates...")
+  // mkdir if not exists
+  /* istanbul ignore else: not relevant */
+  if (!fs.existsSync(appDataPath))
+    fs.mkdirSync(appDataPath)
+  // build the executable url and path
+  const url = "https://github.com/FiloSottile/mkcert/releases/download/" +
+    MKCERT_VERSION + "/"
+  const exe = getExe()
+  const exePath = path.join(appDataPath, exe)
+  // download the executable
+  await download(url + exe, exePath)
+  // make binary executable
+  fs.chmodSync(exePath, "0755")
+  // execute the binary
+  await mkcert(appDataPath, exe)
+  console.log("Certificates generated, installed and trusted. Ready to go!")
+}
+
+async function getCerts() {
+  const certPath = process.env.CERT_PATH || CERT_PATH
+  try {
+    return {
+      key: fs.readFileSync(path.join(certPath, "localhost.key")),
+      cert: fs.readFileSync(path.join(certPath, "localhost.crt"))
+    }
+  } catch (e) {
+    if (certPath !== CERT_PATH) {
+      console.error("Cannot find localhost.key and localhost.crt in the" +
+      " specified path: " + certPath)
+      process.exit(1)
+    } else {
+      // Missing certificates (first run)
+      // generate the certificate
+      await generate(CERT_PATH)
+      // recursive call
+      return getCerts()
+    }
+  }
+}
+
+// delete a folder and the file inside it
+function remove(appDataPath = CERT_PATH) {
+  if (fs.existsSync(appDataPath)) {
+    fs.readdirSync(appDataPath)
+      .forEach(file => fs.unlinkSync(path.join(appDataPath, file)))
+    fs.rmdirSync(appDataPath)
+  }
+}
+
+// run as script
+/* istanbul ignore if: cannot be tested */
+if (require.main === module)
+  // if run with -u or --uninstall
+  if (process.argv.length === 3 &&
+    (process.argv[2] === "-u" || process.argv[2] === "--uninstall")) {
+    remove()
+    console.info("Certificates removed.")
+  } else try { // install
+    generate()
+  } catch (err) { console.error("\nExec error: " + err) }
+
+// export as module
+module.exports = {
+  getCerts,
+  generate,
+  remove
+}
diff --git a/index.js b/index.js
index d5fb907..a66fa17 100755
--- a/index.js
+++ b/index.js
@@ -7,37 +7,27 @@ const http = require("http")
 const https = process.env.NODE_ENV === "production"
   ? require("spdy") : require("https")
 const express = require("express")
-const compression = require("compression")
-const minify = require("express-minify")
+const getCerts = require(path.resolve(__dirname, "certs.js")).getCerts
 
 /* CONFIGURE THE SERVER */
 
 // SSL certificate
-let certOptions
-try {
-  certOptions = {
-    key: fs.readFileSync(path.resolve(__dirname, "cert/localhost.key")),
-    cert: fs.readFileSync(path.resolve(__dirname, "cert/localhost.crt"))
-  }
-} catch (e) /* istanbul ignore next: TODO, not so important */ {
-  console.error("Cannot find the certificates. Try to reinstall the module.")
-  process.exit(1)
-}
-
 const createServer = () => {
   // create a server with express
   const app = express()
 
   // override the default express listen method to use our server
-  app.listen = function(port = process.env.PORT ||
+  app.listen = async function(port = process.env.PORT ||
   /* istanbul ignore next: cannot be tested on Travis */ 443) {
-    app.server = https.createServer(certOptions, app).listen(port)
+    app.server = https.createServer(await getCerts(), app).listen(port)
     console.info("Server running on port " + port + ".")
     return app.server
   }
 
   // use gzip compression minify
   if (process.env.NODE_ENV === "production") {
+    const compression = require("compression")
+    const minify = require("express-minify")
     app.use(compression({ threshold: 1 }))
     app.use(minify())
     app.set("json spaces", 0)
@@ -90,9 +80,29 @@ if (require.main === module) {
   // retrieve the static path from the process argv or use the cwd
   // 1st is node, 2nd is serve or index.js, 3rd (if exists) is the path
   app.serve(process.argv.length === 3 ? process.argv[2] : process.cwd())
-  // redirect http to https
-  app.redirect()
+  // redirect http to https (only if https port is the default one)
+  if (!process.env.PORT) app.redirect()
 }
 
+/* istanbul ignore next: cannot be tested */
+process.on("uncaughtException", function(err) {
+  switch (err.errno) {
+    case "EACCES":
+      console.error(
+        "EACCES: run as administrator to use the default ports 443 and 80. " +
+        "You can also change port with: `PORT=4433 serve ~/myproj`.")
+      break
+    case "EADDRINUSE":
+      console.error("EADDRINUSE: another service on your machine is using " +
+      "port 443 or port 80.\nStop it or change port with:" +
+      "`PORT=4433 serve ~/myproj`.")
+      break
+    default:
+      console.error("Unexpected error " + err.errno + ":\n\n" + err)
+      break
+  }
+  process.exit(1)
+})
+
 // export as module
 module.exports = createServer
diff --git a/package-lock.json b/package-lock.json
index 3204d09..72a135c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "https-localhost",
-  "version": "3.2.0",
+  "version": "4.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -14,12 +14,12 @@
       }
     },
     "@babel/generator": {
-      "version": "7.3.4",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.4.tgz",
-      "integrity": "sha512-8EXhHRFqlVVWXPezBW5keTiQi/rJMQTg/Y9uVCEZ0CAF3PKtCCaVRnp64Ii1ujhkoDhhF1fVsImoN4yJ2uz4Wg==",
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
+      "integrity": "sha512-/v5I+a1jhGSKLgZDcmAUZ4K/VePi43eRkUs3yePW1HB1iANOD5tqJXwGSG4BZhSksP8J9ejSlwGeTiiOFZOrXQ==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.3.4",
+        "@babel/types": "^7.4.0",
         "jsesc": "^2.5.1",
         "lodash": "^4.17.11",
         "source-map": "^0.5.0",
@@ -47,12 +47,12 @@
       }
     },
     "@babel/helper-split-export-declaration": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0.tgz",
-      "integrity": "sha512-MXkOJqva62dfC0w85mEf/LucPPS/1+04nmmRMPEBUB++hiiThQ2zPtX/mEWQ3mtzCEjIJvPY8nuwxXtQeQwUag==",
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.0.tgz",
+      "integrity": "sha512-7Cuc6JZiYShaZnybDmfwhY4UYHzI6rlqhWjaIqbsJGsIqPimEYy5uh3akSRLMg65LSdSEnJ8a8/bWQN6u2oMGw==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.0.0"
+        "@babel/types": "^7.4.0"
       }
     },
     "@babel/highlight": {
@@ -67,34 +67,34 @@
       }
     },
     "@babel/parser": {
-      "version": "7.3.4",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.3.4.tgz",
-      "integrity": "sha512-tXZCqWtlOOP4wgCp6RjRvLmfuhnqTLy9VHwRochJBCP2nDm27JnnuFEnXFASVyQNHk36jD1tAammsCEEqgscIQ==",
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.3.tgz",
+      "integrity": "sha512-gxpEUhTS1sGA63EGQGuA+WESPR/6tz6ng7tSHFCmaTJK/cGK8y37cBTspX+U2xCAue2IQVvF6Z0oigmjwD8YGQ==",
       "dev": true
     },
     "@babel/template": {
-      "version": "7.2.2",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.2.2.tgz",
-      "integrity": "sha512-zRL0IMM02AUDwghf5LMSSDEz7sBCO2YnNmpg3uWTZj/v1rcG2BmQUvaGU8GhU8BvfMh1k2KIAYZ7Ji9KXPUg7g==",
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.0.tgz",
+      "integrity": "sha512-SOWwxxClTTh5NdbbYZ0BmaBVzxzTh2tO/TeLTbF6MO6EzVhHTnff8CdBXx3mEtazFBoysmEM6GU/wF+SuSx4Fw==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "@babel/parser": "^7.2.2",
-        "@babel/types": "^7.2.2"
+        "@babel/parser": "^7.4.0",
+        "@babel/types": "^7.4.0"
       }
     },
     "@babel/traverse": {
-      "version": "7.3.4",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.3.4.tgz",
-      "integrity": "sha512-TvTHKp6471OYEcE/91uWmhR6PrrYywQntCHSaZ8CM8Vmp+pjAusal4nGB2WCCQd0rvI7nOMKn9GnbcvTUz3/ZQ==",
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.3.tgz",
+      "integrity": "sha512-HmA01qrtaCwwJWpSKpA948cBvU5BrmviAief/b3AVw936DtcdsTexlbyzNuDnthwhOQ37xshn7hvQaEQk7ISYQ==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "@babel/generator": "^7.3.4",
+        "@babel/generator": "^7.4.0",
         "@babel/helper-function-name": "^7.1.0",
-        "@babel/helper-split-export-declaration": "^7.0.0",
-        "@babel/parser": "^7.3.4",
-        "@babel/types": "^7.3.4",
+        "@babel/helper-split-export-declaration": "^7.4.0",
+        "@babel/parser": "^7.4.3",
+        "@babel/types": "^7.4.0",
         "debug": "^4.1.0",
         "globals": "^11.1.0",
         "lodash": "^4.17.11"
@@ -118,9 +118,9 @@
       }
     },
     "@babel/types": {
-      "version": "7.3.4",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.3.4.tgz",
-      "integrity": "sha512-WEkp8MsLftM7O/ty580wAmZzN1nDmCACc5+jFzUt+GUFNNIi3LdRlueYz0YIlmJhlZx1QYDMZL5vdWCL0fNjFQ==",
+      "version": "7.4.0",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.0.tgz",
+      "integrity": "sha512-aPvkXyU2SPOnztlgo8n9cEiXW755mgyvueUPcpStqdzoSPm0fjO0vQBjLkt3JKJW7ufikfcnMTTPsN1xaTsBPA==",
       "dev": true,
       "requires": {
         "esutils": "^2.0.2",
@@ -128,6 +128,58 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@mrmlnc/readdir-enhanced": {
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+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
         }
       }
     },
     "yargs-parser": {
-      "version": "11.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-      "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+      "version": "13.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
+      "integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
       "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
@@ -5125,6 +5366,93 @@
         "flat": "^4.1.0",
         "lodash": "^4.17.11",
         "yargs": "^12.0.5"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "get-caller-file": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+          "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
+          "dev": true
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.0.tgz",
+          "integrity": "sha512-pZbTJpoUsCzV48Mc9Nh51VbwO0X9cuPFE8gYwx9BTCt9SF8/b7Zljd2fVgOxhIF/HDTKgpVzs+GPhyKfjLLFRQ==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
+          "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
+          "dev": true
+        },
+        "require-main-filename": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
+          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
+          "dev": true
+        },
+        "yargs": {
+          "version": "12.0.5",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+          "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+          "dev": true,
+          "requires": {
+            "cliui": "^4.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^3.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1 || ^4.0.0",
+            "yargs-parser": "^11.1.1"
+          }
+        },
+        "yargs-parser": {
+          "version": "11.1.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
       }
     }
   }
diff --git a/package.json b/package.json
index 9621532..df5c1eb 100644
--- a/package.json
+++ b/package.json
@@ -1,20 +1,28 @@
 {
   "name": "https-localhost",
-  "version": "4.0.0",
+  "version": "4.1.0",
   "description": "HTTPS server running on localhost",
   "main": "index.js",
   "scripts": {
     "pretest": "eslint --ignore-path .gitignore .",
     "test": "node node_modules/nyc/bin/nyc.js node_modules/mocha/bin/_mocha --exit",
     "posttest": "node node_modules/nyc/bin/nyc.js report --reporter=html",
-    "only-test": "node node_modules/mocha/bin/_mocha --exit",
     "coveralls": "node node_modules/nyc/bin/nyc.js report --reporter=text-lcov | node_modules/coveralls/bin/coveralls.js",
-    "postinstall": "node cert/generate.js",
+    "preuninstall": "node certs.js -u",
+    "build": "pkg --out-path build .",
     "start": "node index.js"
   },
   "bin": {
     "serve": "index.js"
   },
+  "pkg": {
+    "scripts": "*.js",
+    "targets": [
+      "node10-macos-x64",
+      "node10-linux-x64",
+      "node10-win-x64"
+    ]
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/daquinoaldo/https-localhost.git"
@@ -36,6 +44,7 @@
   },
   "homepage": "https://daquinoaldo.github.io/https-localhost",
   "dependencies": {
+    "appdata-path": "^1.0.0",
     "compression": "^1.7.4",
     "express": "^4.16.4",
     "express-minify": "^1.0.0",
@@ -43,13 +52,15 @@
   },
   "devDependencies": {
     "coveralls": "^3.0.3",
-    "eslint": "^5.15.3",
+    "eslint": "^5.16.0",
     "eslint-config-standard": "^12.0.0",
-    "eslint-plugin-import": "^2.16.0",
+    "eslint-plugin-import": "^2.17.2",
     "eslint-plugin-node": "^8.0.1",
-    "eslint-plugin-promise": "^4.0.1",
+    "eslint-plugin-promise": "^4.1.1",
     "eslint-plugin-standard": "^4.0.0",
-    "mocha": "^6.0.2",
-    "nyc": "^13.3.0"
+    "mocha": "^6.1.4",
+    "nyc": "^14.0.0",
+    "pkg": "^4.3.7",
+    "sinon": "^7.3.2"
   }
 }
diff --git a/test/test.js b/test/test.js
index f6e3fab..bfe21d0 100644
--- a/test/test.js
+++ b/test/test.js
@@ -3,7 +3,10 @@ const fs = require("fs")
 const http = require("http")
 const https = require("https")
 
-const app = require("../index.js")()
+const sinon = require("sinon")
+
+let app = require("../index.js")()
+const certs = require("../certs.js")
 
 const HTTPS_PORT = 4443
 const HTTP_PORT = 8080
@@ -34,102 +37,193 @@ function makeRequest(path = "/", secure = true, port = HTTPS_PORT) {
   })
 }
 
+// TEST CERTFICATES
+describe("Testing certs", function() {
+  // timeout 5 min, since requires the mkcert executable download
+  this.timeout(300000)
+
+  it("can be uninstalled", () => {
+    certs.remove()
+  })
+
+  it("uninstall is idempotent (doesn't fail if called twice)", () => {
+    certs.remove()
+  })
+
+  it("can be installed", function(done) {
+    certs.generate().then(done)
+  })
+
+  it("can be installed at first run", function(done) {
+    // inner async function
+    (async() => {
+      // remove certs
+      certs.remove()
+      // prepare the server with a mock response
+      app.get("/test/module", (req, res) => res.send("TEST"))
+      // start the server
+      await app.listen(HTTPS_PORT)
+      // make the request and check the output
+      await makeRequest("/test/module")
+        .then(res => assert(res.data === "TEST"))
+      // close the server
+      app.server.close()
+      done()
+    })()
+  })
+
+  it("crashes if certs doesn't exists in custom folder", function(done) {
+    // inner async function
+    (async() => {
+      // set a non-existent custom cert path
+      process.env.CERT_PATH = "does-not-exist"
+      // stub the exit function
+      sinon.stub(process, "exit")
+      // listen
+      await app.listen(HTTPS_PORT)
+      // should exit 1
+      assert(process.exit.calledWith(1))
+      process.exit.restore()
+      // close the server
+      app.server.close()
+      // restore the CERT_PATH to undefined
+      delete process.env.CERT_PATH
+      done()
+    })()
+  })
+})
+
 // TESTS MODULE
-describe("Testing https-localhost", () => {
+describe("Testing module", () => {
   // close the server after each test
   afterEach(() => app.server.close())
 
-  it("works as a module as custom express app", async function() {
-    // prepare the server with a mock response
-    app.get("/test/module", (req, res) => res.send("TEST"))
-    // start the server
-    await app.listen(HTTPS_PORT)
-    // make the request and check the output
-    await makeRequest("/test/module")
-      .then(res => assert(res.data === "TEST"))
+  it("works as express app", function(done) {
+    (async() => {
+      // prepare the server with a mock response
+      app.get("/test/module", (req, res) => res.send("TEST"))
+      // start the server
+      await app.listen(HTTPS_PORT)
+      // make the request and check the output
+      await makeRequest("/test/module")
+        .then(res => assert(res.data === "TEST"))
+      done()
+    })()
   })
 
-  it("works with environment port", async function() {
-    // prepare the server with a mock response
-    app.get("/test/module", (req, res) => res.send("TEST"))
-    // set the environment port
-    process.env.PORT = HTTPS_PORT
-    // start the server
-    await app.listen()
-    // make the request and check the output
-    await makeRequest("/test/module")
-      .then(res => assert(res.data === "TEST"))
+  it("works with environment port", function(done) {
+    (async() => {
+      // prepare the server with a mock response
+      app.get("/test/module", (req, res) => res.send("TEST"))
+      // set the environment port
+      process.env.PORT = HTTPS_PORT
+      // start the server
+      await app.listen()
+      // make the request and check the output
+      await makeRequest("/test/module")
+        .then(res => assert(res.data === "TEST"))
+      done()
+    })()
   })
+})
 
-  it("serves static files from custom path", async function() {
-    // start the server (serving the test folder)
-    app.serve("test", HTTPS_PORT)
-    // make the request and check the output
-    await makeRequest("/static.html")
-      .then(res => assert(
-        res.data.toString() === fs.readFileSync("test/static.html").toString()))
-  })
+describe("Testing serve", () => {
+  // close the server after each test
+  afterEach(() => app.server.close())
 
-  it("serves static files from default env port", async function() {
-    // set the environment port
-    process.env.PORT = HTTPS_PORT
-    // start the server (serving the default folder)
-    app.serve("test")
-    // make the request and check the output
-    await makeRequest("/static.html")
-      .then(res => assert(res.data.toString() ===
+  it("serves static files from custom path", function(done) {
+    (async() => {
+      // start the server (serving the test folder)
+      app.serve("test", HTTPS_PORT)
+      // make the request and check the output
+      await makeRequest("/static.html")
+        .then(res => assert(res.data.toString() ===
           fs.readFileSync("test/static.html").toString()))
+      done()
+    })()
   })
 
-  it("doesn't crash on 404", async function() {
-    // start the server (serving the default folder)
-    app.serve()
-    // make the request and check the status code
-    await makeRequest("/do-not-exist")
-      .then(res => assert(res.statusCode === 404))
+  it("serves static files from default env port", function(done) {
+    (async() => {
+      // set the environment port
+      process.env.PORT = HTTPS_PORT
+      // start the server (serving the default folder)
+      app.serve("test")
+      // make the request and check the output
+      await makeRequest("/static.html")
+        .then(res => assert(res.data.toString() ===
+            fs.readFileSync("test/static.html").toString()))
+      done()
+    })()
   })
 
-  it("looks for a 404.html file", async function() {
-    // start the server (serving the default folder)
-    await app.serve("test", HTTPS_PORT)
-    // make the request and check the result
-    await makeRequest("/do-not-exist.html")
-      .then(res => {
-        console.log(res)
-        assert(res.statusCode === 404)
-        assert(res.data.toString() ===
-          fs.readFileSync("test/404.html").toString())
-      })
+  it("doesn't crash on 404", function(done) {
+    (async() => {
+      // start the server (serving the default folder)
+      app.serve()
+      // make the request and check the status code
+      await makeRequest("/do-not-exist")
+        .then(res => assert(res.statusCode === 404))
+      done()
+    })()
   })
 
-  it("doesn't crash if the static path doesn't exists", async function() {
-    // start the server (serving a non existing folder)
-    app.serve("do-not-exists")
-    // make the request and check the status code
-    await makeRequest("/")
-      .then(res => assert(res.statusCode === 404))
+  it("looks for a 404.html file", function(done) {
+    (async() => {
+      // start the server (serving the default folder)
+      await app.serve("test", HTTPS_PORT)
+      // make the request and check the result
+      await makeRequest("/do-not-exist.html")
+        .then(res => {
+          assert(res.statusCode === 404)
+          assert(res.data.toString() ===
+            fs.readFileSync("test/404.html").toString())
+        })
+      done()
+    })()
   })
 
-  it("redirect http to https", async function() {
-    // start the redirection
-    await app.redirect(HTTP_PORT)
-    // make the request and check the status
-    await makeRequest("/", false, HTTP_PORT)
-      .then(res => assert(res.statusCode === 301))
+  it("doesn't crash if the static path doesn't exists", function(done) {
+    (async() => {
+      // start the server (serving a non existing folder)
+      app.serve("does-not-exist")
+      // make the request and check the status code
+      await makeRequest("/")
+        .then(res => assert(res.statusCode === 404))
+      done()
+    })()
+  })
+})
+
+// OTHER TESTS
+describe("Testing additional features", () => {
+  it("redirect http to https", function(done) {
+    (async() => {
+      // start the redirection
+      await app.redirect(HTTP_PORT)
+      // make the request and check the status
+      await makeRequest("/", false, HTTP_PORT)
+        .then(res => assert(res.statusCode === 301))
+      done()
+    })()
   })
 
-  // IMPORTANT: this test MUST be the latest one, always.
-  // It delete the cache og the index module,
-  // so the variable app is broken after this test.
-  it("is ready for production", async function() {
-    // set NODE_ENV to production
-    delete require.cache[require.resolve("../index.js")]
-    process.env.NODE_ENV = "production"
-    const production = require("../index.js")()
-    // start the server (serving the test folder)
-    production.serve("test", HTTPS_PORT)
-    // make the request and check the output
-    await makeRequest("/static.html")
-      .then(res => assert(res.headers["content-encoding"] === "gzip"))
+  it("is ready for production", function(done) {
+    (async() => {
+      // set NODE_ENV to production
+      delete require.cache[require.resolve("../index.js")]
+      process.env.NODE_ENV = "production"
+      app = require("../index.js")()
+      // start the server (serving the test folder)
+      app.serve("test", HTTPS_PORT)
+      // make the request and check the output
+      await makeRequest("/static.html")
+        .then(res => assert(res.headers["content-encoding"] === "gzip"))
+      // reset NODE_ENV and app
+      delete require.cache[require.resolve("../index.js")]
+      delete process.env.NODE_ENV
+      app = require("../index.js")()
+      done()
+    })()
   })
 })