diff --git a/src/interceptors/ClientRequest/ClientRequestOverride.ts b/src/interceptors/ClientRequest/ClientRequestOverride.ts
index d8a4443ff..d8ef2db83 100644
--- a/src/interceptors/ClientRequest/ClientRequestOverride.ts
+++ b/src/interceptors/ClientRequest/ClientRequestOverride.ts
@@ -17,6 +17,7 @@ import { normalizeHttpRequestEndParams } from './utils/normalizeHttpRequestEndPa
 const createDebug = require('debug')
 
 export function createClientRequestOverrideClass(
+  protocol: string,
   middleware: RequestMiddleware,
   performOriginalRequest: typeof http.request,
   originalClientRequest: typeof http.ClientRequest
@@ -25,7 +26,7 @@ export function createClientRequestOverrideClass(
     this: http.ClientRequest,
     ...args: Parameters<typeof http.request>
   ) {
-    const [url, options, callback] = normalizeHttpRequestParams(...args)
+    const [url, options, callback] = normalizeHttpRequestParams(protocol, ...args)
     const usesHttps = url.protocol === 'https:'
     let requestBodyBuffer: Buffer[] = []
 
diff --git a/src/interceptors/ClientRequest/index.ts b/src/interceptors/ClientRequest/index.ts
index 947ed78ce..d2b5df838 100644
--- a/src/interceptors/ClientRequest/index.ts
+++ b/src/interceptors/ClientRequest/index.ts
@@ -31,6 +31,7 @@ function handleRequest(
   }
 
   const ClientRequestOverride = createClientRequestOverrideClass(
+    protocol,
     middleware,
     originalMethod,
     originalClientRequest
diff --git a/src/interceptors/ClientRequest/utils/normalizeHttpRequestParams.test.ts b/src/interceptors/ClientRequest/utils/normalizeHttpRequestParams.test.ts
index 3e0855700..fec453feb 100644
--- a/src/interceptors/ClientRequest/utils/normalizeHttpRequestParams.test.ts
+++ b/src/interceptors/ClientRequest/utils/normalizeHttpRequestParams.test.ts
@@ -7,7 +7,7 @@ test('handles [string, callback] input', () => {
     url,
     options,
     callback,
-  ] = normalizeHttpRequestParams('https://mswjs.io/resource', function cb() {})
+  ] = normalizeHttpRequestParams('http', 'https://mswjs.io/resource', function cb() {})
 
   // URL string must be converted to a URL instance
   expect(url.toJSON()).toEqual(new URL('https://mswjs.io/resource').toJSON())
@@ -33,6 +33,7 @@ test('handles [string, RequestOptions, callback] input', () => {
     options,
     callback,
   ] = normalizeHttpRequestParams(
+    'http',
     'https://mswjs.io/resource',
     initialOptions,
     function cb() {}
@@ -50,6 +51,7 @@ test('handles [string, RequestOptions, callback] input', () => {
 
 test('handles [URL, callback] input', () => {
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     new URL('https://mswjs.io/resource'),
     function cb() {}
   )
@@ -69,6 +71,7 @@ test('handles [URL, callback] input', () => {
 
 test('handles [Absolute Legacy URL, callback] input', () => {
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     parse('https://cherry:durian@mswjs.io:12345/resource?apple=banana'),
     function cb() {}
   )
@@ -90,6 +93,7 @@ test('handles [Absolute Legacy URL, callback] input', () => {
 
 test('handles [Relative Legacy URL, RequestOptions without path set, callback] input', () => {
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     parse('/resource?apple=banana'),
     {host: 'mswjs.io'},
     function cb() {}
@@ -109,6 +113,7 @@ test('handles [Relative Legacy URL, RequestOptions without path set, callback] i
 
 test('handles [Relative Legacy URL, RequestOptions with path set, callback] input', () => {
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     parse('/resource?apple=banana'),
     {host: 'mswjs.io', path: '/other?cherry=durian'},
     function cb() {}
@@ -128,12 +133,13 @@ test('handles [Relative Legacy URL, RequestOptions with path set, callback] inpu
 
 test('handles [Relative Legacy URL, callback] input', () => {
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     parse('/resource?apple=banana'),
     function cb() {}
   )
 
   // Correct WHATWG URL generated
-  expect(url.toJSON()).toMatch(getUrlByRequestOptions({path: '/resource?apple=banana'}).toJSON())
+  expect(url.toJSON()).toMatch(getUrlByRequestOptions('http', {path: '/resource?apple=banana'}).toJSON())
 
   // Check path is in options
   expect(options).toHaveProperty('protocol', 'http:')
@@ -145,11 +151,12 @@ test('handles [Relative Legacy URL, callback] input', () => {
 
 test('handles [Relative Legacy URL] input', () => {
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     parse('/resource?apple=banana')
   )
 
   // Correct WHATWG URL generated
-  expect(url.toJSON()).toMatch(getUrlByRequestOptions({path: '/resource?apple=banana'}).toJSON())
+  expect(url.toJSON()).toMatch(getUrlByRequestOptions('http', {path: '/resource?apple=banana'}).toJSON())
 
   // Check path is in options
   expect(options).toHaveProperty('protocol', 'http:')
@@ -161,6 +168,7 @@ test('handles [Relative Legacy URL] input', () => {
 
 test('handles [URL, RequestOptions, callback] input', () => {
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     new URL('https://mswjs.io/resource'),
     {
       headers: {
@@ -196,6 +204,7 @@ test('handles [RequestOptions, callback] input', () => {
     },
   }
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     initialOptions,
     function cb() {}
   )
@@ -212,6 +221,7 @@ test('handles [RequestOptions, callback] input', () => {
 
 test('handles [Empty RequestOptions, callback] input', () => {
   const [_, __, callback] = normalizeHttpRequestParams(
+    'http',
     {},
     function cb() {}
   )
@@ -237,6 +247,7 @@ test('handles [PartialRequestOptions, callback] input', () => {
     agent: false,
   }
   const [url, options, callback] = normalizeHttpRequestParams(
+    'http',
     initialOptions,
     function cb() {}
   )
diff --git a/src/interceptors/ClientRequest/utils/normalizeHttpRequestParams.ts b/src/interceptors/ClientRequest/utils/normalizeHttpRequestParams.ts
index 2a5cdaf73..5c428a96e 100644
--- a/src/interceptors/ClientRequest/utils/normalizeHttpRequestParams.ts
+++ b/src/interceptors/ClientRequest/utils/normalizeHttpRequestParams.ts
@@ -36,6 +36,7 @@ function resolveCallback(
  * so it always has a `URL` and `RequestOptions`.
  */
 export function normalizeHttpRequestParams(
+  defaultProtocol: string,
   ...args: HttpRequestArgs
 ): [URL, RequestOptions & RequestSelf, HttpRequestCallback?] {
   let url: URL
@@ -83,10 +84,12 @@ export function normalizeHttpRequestParams(
 
       return isObject(args[1])
         ? normalizeHttpRequestParams(
+            defaultProtocol,
             { path: legacyUrl.path, ...args[1] },
             args[2]
           )
         : normalizeHttpRequestParams(
+            defaultProtocol,
             { path: legacyUrl.path },
             args[1] as HttpRequestCallback
           )
@@ -98,10 +101,10 @@ export function normalizeHttpRequestParams(
     const resolvedUrl = new URL(legacyUrl.href)
 
     return args[1] === undefined
-      ? normalizeHttpRequestParams(resolvedUrl)
+      ? normalizeHttpRequestParams(defaultProtocol, resolvedUrl)
       : typeof args[1] === 'function'
-      ? normalizeHttpRequestParams(resolvedUrl, args[1])
-      : normalizeHttpRequestParams(resolvedUrl, args[1], args[2])
+      ? normalizeHttpRequestParams(defaultProtocol, resolvedUrl, args[1])
+      : normalizeHttpRequestParams(defaultProtocol, resolvedUrl, args[1], args[2])
   }
   // Handle a given RequestOptions object as-is
   // and derive the URL instance from it.
@@ -109,7 +112,7 @@ export function normalizeHttpRequestParams(
     options = args[0]
     debug('given request options:', options)
 
-    url = getUrlByRequestOptions(options)
+    url = getUrlByRequestOptions(defaultProtocol, options)
     debug('created a URL:', url)
 
     callback = resolveCallback(args)
diff --git a/src/utils/getUrlByRequestOptions.test.ts b/src/utils/getUrlByRequestOptions.test.ts
index 9c22a313b..c94baff54 100644
--- a/src/utils/getUrlByRequestOptions.test.ts
+++ b/src/utils/getUrlByRequestOptions.test.ts
@@ -8,7 +8,7 @@ test('returns a URL based on the basic RequestOptions', () => {
     host: '127.0.0.1',
     path: '/resource',
   }
-  const url = getUrlByRequestOptions(options)
+  const url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('port', '')
@@ -21,7 +21,7 @@ test('inherits protocol and port from http.Agent, if set', () => {
     path: '/',
     agent: new HttpAgent(),
   }
-  const url = getUrlByRequestOptions(options)
+  const url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('protocol', 'http:')
@@ -37,7 +37,7 @@ test('inherits protocol and port from https.Agent, if set', () => {
       port: 3080,
     }),
   }
-  const url = getUrlByRequestOptions(options)
+  const url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('protocol', 'https:')
@@ -45,12 +45,19 @@ test('inherits protocol and port from https.Agent, if set', () => {
   expect(url).toHaveProperty('href', 'https://127.0.0.1:3080/')
 })
 
-test('resolves protocol to "http" given no explicit protocol and no certificate', () => {
+test('resolves protocol from default given no explicit protocol and no certificate', () => {
   const options: RequestOptions = {
     host: '127.0.0.1',
     path: '/',
   }
-  const url = getUrlByRequestOptions(options)
+  let url = getUrlByRequestOptions('https', options)
+
+  expect(url).toBeInstanceOf(URL)
+  expect(url).toHaveProperty('protocol', 'https:')
+  expect(url).toHaveProperty('port', '')
+  expect(url).toHaveProperty('href', 'https://127.0.0.1/')
+
+  url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('protocol', 'http:')
@@ -64,7 +71,7 @@ test('resolves protocol to "https" given no explicit protocol, but certificate',
     path: '/secure',
     cert: '<!-- SSL certificate -->',
   }
-  const url = getUrlByRequestOptions(options)
+  const url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('protocol', 'https:')
@@ -78,7 +85,7 @@ test('resolves protocol to "https" given no explicit protocol, but port is 443',
     port: 443,
     path: '/resource',
   }
-  const url = getUrlByRequestOptions(options)
+  const url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('port', '')
@@ -93,7 +100,7 @@ test('resolves protocol to "https" given no explicit protocol, but agent port is
     }),
     path: '/resource',
   }
-  const url = getUrlByRequestOptions(options)
+  const url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('port', '')
@@ -107,7 +114,7 @@ test('inherits "port" if given', () => {
     port: 4002,
     path: '/',
   }
-  const url = getUrlByRequestOptions(options)
+  const url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('port', '4002')
@@ -122,7 +129,7 @@ test('inherits "username" and "password"', () => {
     path: '/user',
     auth: 'admin:abc-123',
   }
-  const url = getUrlByRequestOptions(options)
+  const url = getUrlByRequestOptions('http', options)
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('username', 'admin')
@@ -132,7 +139,7 @@ test('inherits "username" and "password"', () => {
 })
 
 test('resolves hostname to localhost if none provided', () => {
-  const url = getUrlByRequestOptions({})
+  const url = getUrlByRequestOptions('http', {})
 
   expect(url).toBeInstanceOf(URL)
   expect(url).toHaveProperty('protocol', 'http:')
diff --git a/src/utils/getUrlByRequestOptions.ts b/src/utils/getUrlByRequestOptions.ts
index 238c4f6a1..374330bf2 100644
--- a/src/utils/getUrlByRequestOptions.ts
+++ b/src/utils/getUrlByRequestOptions.ts
@@ -7,9 +7,7 @@ const debug = require('debug')('utils getUrlByRequestOptions')
 type IsomorphicRequestOptions = RequestOptions & RequestSelf
 
 export const DEFAULT_PATH = '/'
-const DEFAULT_PROTOCOL = 'http:'
 const DEFAULT_HOST = 'localhost'
-const DEFAULT_PORT = 80
 const SSL_PORT = 443
 
 function getAgent(
@@ -19,6 +17,7 @@ function getAgent(
 }
 
 function getProtocolByRequestOptions(
+  defaultProtocol: string,
   options: IsomorphicRequestOptions
 ): string {
   if (options.protocol) {
@@ -36,7 +35,7 @@ function getProtocolByRequestOptions(
 
   const isSecureRequest = options.cert || port === SSL_PORT
 
-  return isSecureRequest ? 'https:' : options.uri?.protocol || DEFAULT_PROTOCOL
+  return isSecureRequest ? 'https:' : options.uri?.protocol || `${defaultProtocol}:`
 }
 
 function getPortByRequestOptions(
@@ -49,7 +48,7 @@ function getPortByRequestOptions(
   const optionsPort = options.port
 
   if (optionsPort || agentPort) {
-    const explicitPort = optionsPort || agentPort || DEFAULT_PORT
+    const explicitPort = optionsPort || agentPort
     return Number(explicitPort)
   }
 }
@@ -68,10 +67,10 @@ function getAuthByRequestOptions(options: IsomorphicRequestOptions) {
 /**
  * Creates a `URL` instance from a given `RequestOptions` object.
  */
-export function getUrlByRequestOptions(options: IsomorphicRequestOptions): URL {
+export function getUrlByRequestOptions(defaultProtocol: string, options: IsomorphicRequestOptions): URL {
   debug('request options', options)
 
-  const protocol = getProtocolByRequestOptions(options)
+  const protocol = getProtocolByRequestOptions(defaultProtocol, options)
   const host = getHostByRequestOptions(options)
   const port = getPortByRequestOptions(options)
   const path = options.path || DEFAULT_PATH