diff --git a/lib/common.js b/lib/common.js
index ae4966e51..9c5416cfc 100644
--- a/lib/common.js
+++ b/lib/common.js
@@ -13,8 +13,8 @@ const timers = require('timers')
  * @param  {Object} options - a parsed options object of the request
  */
 function normalizeRequestOptions(options) {
-  options.proto = options.proto || 'http'
-  options.port = options.port || (options.proto === 'http' ? 80 : 443)
+  options.protocol = options.protocol || 'http:'
+  options.port = options.port || (options.protocol === 'http:' ? 80 : 443)
   if (options.host) {
     debug('options.host:', options.host)
     if (!options.hostname) {
@@ -135,14 +135,14 @@ function restoreOverriddenRequests() {
  * In WHATWG URL vernacular, this returns the origin portion of a URL.
  * However, the port is not included if it's standard and not already present on the host.
  */
-function normalizeOrigin(proto, host, port) {
+function normalizeOrigin(protocol, host, port) {
   const hostHasPort = host.includes(':')
   const portIsStandard =
-    (proto === 'http' && (port === 80 || port === '80')) ||
-    (proto === 'https' && (port === 443 || port === '443'))
+    (protocol === 'http:' && (port === 80 || port === '80')) ||
+    (protocol === 'https:' && (port === 443 || port === '443'))
   const portStr = hostHasPort || portIsStandard ? '' : `:${port}`
 
-  return `${proto}://${host}${portStr}`
+  return `${protocol}//${host}${portStr}`
 }
 
 /**
@@ -150,7 +150,7 @@ function normalizeOrigin(proto, host, port) {
  * @param  {Object} options
  * @param  {string} options.method
  * @param  {number|string} options.port
- * @param  {string} options.proto Set internally. always http or https
+ * @param  {string} options.protocol Set internally. always http: or https:
  * @param  {string} options.hostname
  * @param  {string} options.path
  * @param  {Object} options.headers
@@ -159,7 +159,7 @@ function normalizeOrigin(proto, host, port) {
  */
 function stringifyRequest(options, body) {
   const { method = 'GET', path = '', port } = options
-  const origin = normalizeOrigin(options.proto, options.hostname, port)
+  const origin = normalizeOrigin(options.protocol, options.hostname, port)
 
   const log = {
     method,
@@ -620,11 +620,11 @@ function isPlainObject(value) {
   if (Object.getPrototypeOf(value) === null) {
     return true
   }
-  let proto = value
-  while (Object.getPrototypeOf(proto) !== null) {
-    proto = Object.getPrototypeOf(proto)
+  let prototype = value
+  while (Object.getPrototypeOf(prototype) !== null) {
+    prototype = Object.getPrototypeOf(prototype)
   }
-  return Object.getPrototypeOf(value) === proto
+  return Object.getPrototypeOf(value) === prototype
 }
 
 /**
diff --git a/lib/intercept.js b/lib/intercept.js
index 7710f13b2..202244311 100644
--- a/lib/intercept.js
+++ b/lib/intercept.js
@@ -147,7 +147,7 @@ function interceptorsFor(options) {
 
   debug('interceptors for %j', options.host)
 
-  const basePath = `${options.proto}://${options.host}`
+  const basePath = `${options.protocol}//${options.host}`
 
   debug('filtering interceptors for basepath', basePath)
 
@@ -194,22 +194,22 @@ function interceptorsFor(options) {
     }
   }
 
-  return undefined
+  return
 }
 
 function removeInterceptor(options) {
   // Lazily import to avoid circular imports.
   const Interceptor = require('./interceptor')
 
-  let baseUrl, key, method, proto
+  let baseUrl, key, method, protocol
   if (options instanceof Interceptor) {
     baseUrl = options.basePath
     key = options._key
   } else {
-    proto = options.proto ? options.proto : 'http'
+    protocol = options.protocol ? options.protocol : 'http:'
 
     common.normalizeRequestOptions(options)
-    baseUrl = `${proto}://${options.host}`
+    baseUrl = `${protocol}//${options.host}`
     method = (options.method && options.method.toUpperCase()) || 'GET'
     key = `${method} ${baseUrl}${options.path || '/'}`
   }
diff --git a/lib/interceptor.js b/lib/interceptor.js
index 1b273fd6b..4c5eaa755 100644
--- a/lib/interceptor.js
+++ b/lib/interceptor.js
@@ -250,7 +250,7 @@ module.exports = class Interceptor {
     let { path = '/' } = options
     let matches
     let matchKey
-    const { proto } = options
+    const { protocol } = options
 
     if (this.method !== method) {
       this.scope.logger(
@@ -330,13 +330,13 @@ module.exports = class Interceptor {
     }
 
     // If we have a filtered scope then we use it instead reconstructing the
-    // scope from the request options (proto, host and port) as these two won't
+    // scope from the request options (protocol, host and port) as these two won't
     // necessarily match and we have to remove the scope that was matched (vs.
     // that was defined).
     if (this.__nock_filteredScope) {
       matchKey = this.__nock_filteredScope
     } else {
-      matchKey = common.normalizeOrigin(proto, options.host, options.port)
+      matchKey = common.normalizeOrigin(protocol, options.host, options.port)
     }
 
     if (typeof this.uri === 'function') {
@@ -359,6 +359,7 @@ module.exports = class Interceptor {
       }
 
       matches = matchBody(options, this._requestBody, body)
+
       if (!matches) {
         this.scope.logger(
           "bodies don't match: \n",
@@ -383,7 +384,7 @@ module.exports = class Interceptor {
 
     const method = (options.method || 'GET').toUpperCase()
     let { path } = options
-    const { proto } = options
+    const { protocol } = options
 
     // NOTE: Do not split off the query params as the regex could use them
     if (!isRegex) {
@@ -394,7 +395,7 @@ module.exports = class Interceptor {
       path = this.scope.transformPathFunction(path)
     }
     const comparisonKey = isPathFn || isRegex ? this.__nock_scopeKey : this._key
-    const matchKey = `${method} ${proto}://${options.host}${path}`
+    const matchKey = `${method} ${protocol}//${options.host}${path}`
 
     if (isPathFn) {
       return !!(matchKey.match(comparisonKey) && this.path(path))
diff --git a/modules/intercept-node-http/lib/socket.js b/modules/intercept-node-http/lib/socket.js
index 5f5fdcb66..7e27d7abc 100644
--- a/modules/intercept-node-http/lib/socket.js
+++ b/modules/intercept-node-http/lib/socket.js
@@ -7,7 +7,7 @@ class Socket extends EventEmitter {
     super()
 
     // Pretend this is a TLSSocket
-    if (options.proto === 'https') {
+    if (options.protocol === 'https:') {
       // https://github.com/nock/nock/issues/158
       this.authorized = true
       // https://github.com/nock/nock/issues/2147
diff --git a/modules/intercept-node-http/lib/utils.js b/modules/intercept-node-http/lib/utils.js
index 252946c19..6b2296593 100644
--- a/modules/intercept-node-http/lib/utils.js
+++ b/modules/intercept-node-http/lib/utils.js
@@ -88,9 +88,9 @@ function isPlainObject(value) {
   if (Object.getPrototypeOf(value) === null) {
     return true
   }
-  let proto = value
-  while (Object.getPrototypeOf(proto) !== null) {
-    proto = Object.getPrototypeOf(proto)
+  let prototype = value
+  while (Object.getPrototypeOf(prototype) !== null) {
+    prototype = Object.getPrototypeOf(prototype)
   }
-  return Object.getPrototypeOf(value) === proto
+  return Object.getPrototypeOf(value) === prototype
 }