diff --git a/dist/index.js b/dist/index.js
index 2db8e57..b4be0fa 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -20206,6 +20206,7 @@ function request (opts, callback) {
 }
 
 module.exports = request
+module.exports.RequestHandler = RequestHandler
 
 
 /***/ }),
@@ -20752,7 +20753,7 @@ module.exports = class BodyReadable extends Readable {
       this
         .on('close', function () {
           signalListenerCleanup()
-          if (signal?.aborted) {
+          if (signal && signal.aborted) {
             reject(signal.reason || Object.assign(new Error('The operation was aborted'), { name: 'AbortError' }))
           } else {
             resolve(null)
@@ -22146,13 +22147,13 @@ module.exports = {
 /***/ }),
 
 /***/ 9174:
-/***/ ((module) => {
+/***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
 "use strict";
 
 
 module.exports = {
-  kConstruct: Symbol('constructable')
+  kConstruct: (__nccwpck_require__(2785).kConstruct)
 }
 
 
@@ -23138,11 +23139,9 @@ class Parser {
       socket[kReset] = true
     }
 
-    let pause
-    try {
-      pause = request.onHeaders(statusCode, headers, this.resume, statusText) === false
-    } catch (err) {
-      util.destroy(socket, err)
+    const pause = request.onHeaders(statusCode, headers, this.resume, statusText) === false
+
+    if (request.aborted) {
       return -1
     }
 
@@ -23189,13 +23188,8 @@ class Parser {
 
     this.bytesRead += buf.length
 
-    try {
-      if (request.onData(buf) === false) {
-        return constants.ERROR.PAUSED
-      }
-    } catch (err) {
-      util.destroy(socket, err)
-      return -1
+    if (request.onData(buf) === false) {
+      return constants.ERROR.PAUSED
     }
   }
 
@@ -23236,11 +23230,7 @@ class Parser {
       return -1
     }
 
-    try {
-      request.onComplete(headers)
-    } catch (err) {
-      errorRequest(client, request, err)
-    }
+    request.onComplete(headers)
 
     client[kQueue][client[kRunningIdx]++] = null
 
@@ -24026,13 +24016,17 @@ function writeH2 (client, session, request) {
   })
 
   stream.on('data', (chunk) => {
-    if (request.onData(chunk) === false) stream.pause()
+    if (request.onData(chunk) === false) {
+      stream.pause()
+    }
   })
 
   stream.once('close', () => {
     h2State.openStreams -= 1
     // TODO(HTTP/2): unref only if current streams count is 0
-    if (h2State.openStreams === 0) session.unref()
+    if (h2State.openStreams === 0) {
+      session.unref()
+    }
   })
 
   stream.once('error', function (err) {
@@ -26075,7 +26069,11 @@ class Request {
 
   onBodySent (chunk) {
     if (this[kHandler].onBodySent) {
-      return this[kHandler].onBodySent(chunk)
+      try {
+        return this[kHandler].onBodySent(chunk)
+      } catch (err) {
+        this.abort(err)
+      }
     }
   }
 
@@ -26085,7 +26083,11 @@ class Request {
     }
 
     if (this[kHandler].onRequestSent) {
-      return this[kHandler].onRequestSent()
+      try {
+        return this[kHandler].onRequestSent()
+      } catch (err) {
+        this.abort(err)
+      }
     }
   }
 
@@ -26109,14 +26111,23 @@ class Request {
       channels.headers.publish({ request: this, response: { statusCode, headers, statusText } })
     }
 
-    return this[kHandler].onHeaders(statusCode, headers, resume, statusText)
+    try {
+      return this[kHandler].onHeaders(statusCode, headers, resume, statusText)
+    } catch (err) {
+      this.abort(err)
+    }
   }
 
   onData (chunk) {
     assert(!this.aborted)
     assert(!this.completed)
 
-    return this[kHandler].onData(chunk)
+    try {
+      return this[kHandler].onData(chunk)
+    } catch (err) {
+      this.abort(err)
+      return false
+    }
   }
 
   onUpgrade (statusCode, headers, socket) {
@@ -26135,7 +26146,13 @@ class Request {
     if (channels.trailers.hasSubscribers) {
       channels.trailers.publish({ request: this, trailers })
     }
-    return this[kHandler].onComplete(trailers)
+
+    try {
+      return this[kHandler].onComplete(trailers)
+    } catch (err) {
+      // TODO (fix): This might be a bad idea?
+      this.onError(err)
+    }
   }
 
   onError (error) {
@@ -26149,6 +26166,7 @@ class Request {
       return
     }
     this.aborted = true
+
     return this[kHandler].onError(error)
   }
 
@@ -26386,7 +26404,8 @@ module.exports = {
   kHTTP1BuildRequest: Symbol('http1 build request'),
   kHTTP2CopyHeaders: Symbol('http2 copy headers'),
   kHTTPConnVersion: Symbol('http connection version'),
-  kRetryHandlerDefaultRetry: Symbol('retry agent default retry')
+  kRetryHandlerDefaultRetry: Symbol('retry agent default retry'),
+  kConstruct: Symbol('constructable')
 }
 
 
@@ -28034,17 +28053,14 @@ function dataURLProcessor (dataURL) {
  * @param {boolean} excludeFragment
  */
 function URLSerializer (url, excludeFragment = false) {
-  const href = url.href
-
   if (!excludeFragment) {
-    return href
+    return url.href
   }
 
-  const hash = href.lastIndexOf('#')
-  if (hash === -1) {
-    return href
-  }
-  return href.slice(0, hash)
+  const href = url.href
+  const hashLength = url.hash.length
+
+  return hashLength === 0 ? href : href.substring(0, href.length - hashLength)
 }
 
 // https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points
@@ -29228,7 +29244,7 @@ module.exports = {
 
 
 
-const { kHeadersList } = __nccwpck_require__(2785)
+const { kHeadersList, kConstruct } = __nccwpck_require__(2785)
 const { kGuard } = __nccwpck_require__(5861)
 const { kEnumerableProperty } = __nccwpck_require__(3983)
 const {
@@ -29466,6 +29482,9 @@ class HeadersList {
 // https://fetch.spec.whatwg.org/#headers-class
 class Headers {
   constructor (init = undefined) {
+    if (init === kConstruct) {
+      return
+    }
     this[kHeadersList] = new HeadersList()
 
     // The new Headers(init) constructor steps are:
@@ -30106,7 +30125,7 @@ function finalizeAndReportTiming (response, initiatorType = 'other') {
   }
 
   // 8. If response’s timing allow passed flag is not set, then:
-  if (!timingInfo.timingAllowPassed) {
+  if (!response.timingAllowPassed) {
     //  1. Set timingInfo to a the result of creating an opaque timing info for timingInfo.
     timingInfo = createOpaqueTimingInfo({
       startTime: timingInfo.startTime
@@ -31983,7 +32002,8 @@ const {
   isValidHTTPToken,
   sameOrigin,
   normalizeMethod,
-  makePolicyContainer
+  makePolicyContainer,
+  normalizeMethodRecord
 } = __nccwpck_require__(2538)
 const {
   forbiddenMethodsSet,
@@ -32000,13 +32020,12 @@ const { kHeaders, kSignal, kState, kGuard, kRealm } = __nccwpck_require__(5861)
 const { webidl } = __nccwpck_require__(1744)
 const { getGlobalOrigin } = __nccwpck_require__(1246)
 const { URLSerializer } = __nccwpck_require__(685)
-const { kHeadersList } = __nccwpck_require__(2785)
+const { kHeadersList, kConstruct } = __nccwpck_require__(2785)
 const assert = __nccwpck_require__(9491)
 const { getMaxListeners, setMaxListeners, getEventListeners, defaultMaxListeners } = __nccwpck_require__(2361)
 
 let TransformStream = globalThis.TransformStream
 
-const kInit = Symbol('init')
 const kAbortController = Symbol('abortController')
 
 const requestFinalizer = new FinalizationRegistry(({ signal, abort }) => {
@@ -32017,7 +32036,7 @@ const requestFinalizer = new FinalizationRegistry(({ signal, abort }) => {
 class Request {
   // https://fetch.spec.whatwg.org/#dom-request
   constructor (input, init = {}) {
-    if (input === kInit) {
+    if (input === kConstruct) {
       return
     }
 
@@ -32156,8 +32175,10 @@ class Request {
       urlList: [...request.urlList]
     })
 
+    const initHasKey = Object.keys(init).length !== 0
+
     // 13. If init is not empty, then:
-    if (Object.keys(init).length > 0) {
+    if (initHasKey) {
       // 1. If request’s mode is "navigate", then set it to "same-origin".
       if (request.mode === 'navigate') {
         request.mode = 'same-origin'
@@ -32272,7 +32293,7 @@ class Request {
     }
 
     // 23. If init["integrity"] exists, then set request’s integrity metadata to it.
-    if (init.integrity !== undefined && init.integrity != null) {
+    if (init.integrity != null) {
       request.integrity = String(init.integrity)
     }
 
@@ -32288,16 +32309,16 @@ class Request {
 
       // 2. If method is not a method or method is a forbidden method, then
       // throw a TypeError.
-      if (!isValidHTTPToken(init.method)) {
-        throw new TypeError(`'${init.method}' is not a valid HTTP method.`)
+      if (!isValidHTTPToken(method)) {
+        throw new TypeError(`'${method}' is not a valid HTTP method.`)
       }
 
       if (forbiddenMethodsSet.has(method.toUpperCase())) {
-        throw new TypeError(`'${init.method}' HTTP method is unsupported.`)
+        throw new TypeError(`'${method}' HTTP method is unsupported.`)
       }
 
       // 3. Normalize method.
-      method = normalizeMethod(init.method)
+      method = normalizeMethodRecord[method] ?? normalizeMethod(method)
 
       // 4. Set request’s method to method.
       request.method = method
@@ -32368,7 +32389,7 @@ class Request {
     // 30. Set this’s headers to a new Headers object with this’s relevant
     // Realm, whose header list is request’s header list and guard is
     // "request".
-    this[kHeaders] = new Headers()
+    this[kHeaders] = new Headers(kConstruct)
     this[kHeaders][kHeadersList] = request.headersList
     this[kHeaders][kGuard] = 'request'
     this[kHeaders][kRealm] = this[kRealm]
@@ -32388,25 +32409,25 @@ class Request {
     }
 
     // 32. If init is not empty, then:
-    if (Object.keys(init).length !== 0) {
+    if (initHasKey) {
+      /** @type {HeadersList} */
+      const headersList = this[kHeaders][kHeadersList]
       // 1. Let headers be a copy of this’s headers and its associated header
       // list.
-      let headers = new Headers(this[kHeaders])
-
       // 2. If init["headers"] exists, then set headers to init["headers"].
-      if (init.headers !== undefined) {
-        headers = init.headers
-      }
+      const headers = init.headers !== undefined ? init.headers : new HeadersList(headersList)
 
       // 3. Empty this’s headers’s header list.
-      this[kHeaders][kHeadersList].clear()
+      headersList.clear()
 
       // 4. If headers is a Headers object, then for each header in its header
       // list, append header’s name/header’s value to this’s headers.
-      if (headers.constructor.name === 'Headers') {
+      if (headers instanceof HeadersList) {
         for (const [key, val] of headers) {
-          this[kHeaders].append(key, val)
+          headersList.append(key, val)
         }
+        // Note: Copy the `set-cookie` meta-data.
+        headersList.cookies = headers.cookies
       } else {
         // 5. Otherwise, fill this’s headers with headers.
         fillHeaders(this[kHeaders], headers)
@@ -32695,10 +32716,10 @@ class Request {
 
     // 3. Let clonedRequestObject be the result of creating a Request object,
     // given clonedRequest, this’s headers’s guard, and this’s relevant Realm.
-    const clonedRequestObject = new Request(kInit)
+    const clonedRequestObject = new Request(kConstruct)
     clonedRequestObject[kState] = clonedRequest
     clonedRequestObject[kRealm] = this[kRealm]
-    clonedRequestObject[kHeaders] = new Headers()
+    clonedRequestObject[kHeaders] = new Headers(kConstruct)
     clonedRequestObject[kHeaders][kHeadersList] = clonedRequest.headersList
     clonedRequestObject[kHeaders][kGuard] = this[kHeaders][kGuard]
     clonedRequestObject[kHeaders][kRealm] = this[kHeaders][kRealm]
@@ -32948,7 +32969,7 @@ const { webidl } = __nccwpck_require__(1744)
 const { FormData } = __nccwpck_require__(2015)
 const { getGlobalOrigin } = __nccwpck_require__(1246)
 const { URLSerializer } = __nccwpck_require__(685)
-const { kHeadersList } = __nccwpck_require__(2785)
+const { kHeadersList, kConstruct } = __nccwpck_require__(2785)
 const assert = __nccwpck_require__(9491)
 const { types } = __nccwpck_require__(3837)
 
@@ -33069,7 +33090,7 @@ class Response {
     // 2. Set this’s headers to a new Headers object with this’s relevant
     // Realm, whose header list is this’s response’s header list and guard
     // is "response".
-    this[kHeaders] = new Headers()
+    this[kHeaders] = new Headers(kConstruct)
     this[kHeaders][kGuard] = 'response'
     this[kHeaders][kHeadersList] = this[kState].headersList
     this[kHeaders][kRealm] = this[kRealm]
@@ -33439,11 +33460,7 @@ webidl.converters.XMLHttpRequestBodyInit = function (V) {
     return webidl.converters.Blob(V, { strict: false })
   }
 
-  if (
-    types.isAnyArrayBuffer(V) ||
-    types.isTypedArray(V) ||
-    types.isDataView(V)
-  ) {
+  if (types.isArrayBuffer(V) || types.isTypedArray(V) || types.isDataView(V)) {
     return webidl.converters.BufferSource(V)
   }
 
@@ -34224,11 +34241,30 @@ function isCancelled (fetchParams) {
     fetchParams.controller.state === 'terminated'
 }
 
-// https://fetch.spec.whatwg.org/#concept-method-normalize
+const normalizeMethodRecord = {
+  delete: 'DELETE',
+  DELETE: 'DELETE',
+  get: 'GET',
+  GET: 'GET',
+  head: 'HEAD',
+  HEAD: 'HEAD',
+  options: 'OPTIONS',
+  OPTIONS: 'OPTIONS',
+  post: 'POST',
+  POST: 'POST',
+  put: 'PUT',
+  PUT: 'PUT'
+}
+
+// Note: object prototypes should not be able to be referenced. e.g. `Object#hasOwnProperty`.
+Object.setPrototypeOf(normalizeMethodRecord, null)
+
+/**
+ * @see https://fetch.spec.whatwg.org/#concept-method-normalize
+ * @param {string} method
+ */
 function normalizeMethod (method) {
-  return /^(DELETE|GET|HEAD|OPTIONS|POST|PUT)$/i.test(method)
-    ? method.toUpperCase()
-    : method
+  return normalizeMethodRecord[method.toLowerCase()] ?? method
 }
 
 // https://infra.spec.whatwg.org/#serialize-a-javascript-value-to-a-json-string
@@ -34573,7 +34609,8 @@ module.exports = {
   urlIsLocal,
   urlHasHttpsScheme,
   urlIsHttpHttpsScheme,
-  readAllBytes
+  readAllBytes,
+  normalizeMethodRecord
 }
 
 
@@ -36697,7 +36734,7 @@ module.exports = RedirectHandler
 /***/ 2286:
 /***/ ((module, __unused_webpack_exports, __nccwpck_require__) => {
 
-const assert = __nccwpck_require__(8061)
+const assert = __nccwpck_require__(9491)
 
 const { kRetryHandlerDefaultRetry } = __nccwpck_require__(2785)
 const { RequestRetryError } = __nccwpck_require__(8045)
@@ -36794,7 +36831,7 @@ class RetryHandler {
   }
 
   onBodySent (chunk) {
-    return this.handler.onBodySent(chunk)
+    if (this.handler.onBodySent) return this.handler.onBodySent(chunk)
   }
 
   static [kRetryHandlerDefaultRetry] (err, { state, opts }, cb) {
@@ -38957,6 +38994,9 @@ class ProxyAgent extends DispatcherBase {
     this[kProxyTls] = opts.proxyTls
     this[kProxyHeaders] = opts.headers || {}
 
+    const resolvedUrl = new URL(opts.uri)
+    const { origin, port, host, username, password } = resolvedUrl
+
     if (opts.auth && opts.token) {
       throw new InvalidArgumentError('opts.auth cannot be used in combination with opts.token')
     } else if (opts.auth) {
@@ -38964,11 +39004,10 @@ class ProxyAgent extends DispatcherBase {
       this[kProxyHeaders]['proxy-authorization'] = `Basic ${opts.auth}`
     } else if (opts.token) {
       this[kProxyHeaders]['proxy-authorization'] = opts.token
+    } else if (username && password) {
+      this[kProxyHeaders]['proxy-authorization'] = `Basic ${Buffer.from(`${decodeURIComponent(username)}:${decodeURIComponent(password)}`).toString('base64')}`
     }
 
-    const resolvedUrl = new URL(opts.uri)
-    const { origin, port, host } = resolvedUrl
-
     const connect = buildConnector({ ...opts.proxyTls })
     this[kConnectEndpoint] = buildConnector({ ...opts.requestTls })
     this[kClient] = clientFactory(resolvedUrl, { connect })
@@ -38992,7 +39031,7 @@ class ProxyAgent extends DispatcherBase {
           })
           if (statusCode !== 200) {
             socket.on('error', () => {}).destroy()
-            callback(new RequestAbortedError('Proxy response !== 200 when HTTP Tunneling'))
+            callback(new RequestAbortedError(`Proxy response (${statusCode}) !== 200 when HTTP Tunneling`))
           }
           if (opts.protocol !== 'https:') {
             callback(null, socket)
@@ -41907,14 +41946,6 @@ module.exports = require("net");
 
 /***/ }),
 
-/***/ 8061:
-/***/ ((module) => {
-
-"use strict";
-module.exports = require("node:assert");
-
-/***/ }),
-
 /***/ 5673:
 /***/ ((module) => {