尽可能多地了解 Web 应用程序背后的技术堆栈以便充分利用它总是很有用的。获取有关应用程序的信息的一种简单方法是查看 404 未找到页面。如果网站尚未创建自定义 404 页面，则可以使用它来识别网站所使用的框架/语言。
技术
nginx
nginx是一个反向代理/网络服务器/负载均衡器应用程序。它可用于提供静态页面，或管理其后面运行的各种应用程序。
默认的 404 页面如下所示：
来源很简单：
<html>
<head><title>404 Not Found</title></head>
<body>
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.24.0</center>
</body>
</html>
它有这个源代码：
static char ngx_http_error_404_page[] =
"<html>" CRLF
"<head><title>404 Not Found</title></head>" CRLF
"<body>" CRLF
"<center><h1>404 Not Found</h1></center>" CRLF
;
阿帕奇 / httpd
Apache httpd Web 服务器与 nginx 类似，用于提供静态页面或将请求路由到所需的备份应用程序。它的 404 页面如下所示：
它通常包括 Apache 版本和操作系统。该页面的 HTML 源代码如下所示：
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL was not found on this server.</p>
<hr>
<address>Apache/2.4.41 (Ubuntu) Server at 10.10.11.136 Port 80</address>
</body></html>
信息系统
IIS是微软的网络服务器。默认的 404 页面如下所示：
原始 HTML 包含内联 CSS：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
<title>404 - File or directory not found.</title>
<style type="text/css">
<!--
body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;}
fieldset{padding:0 15px 10px 15px;}
h1{font-size:2.4em;margin:0;color:#FFF;}
h2{font-size:1.7em;margin:0;color:#CC0000;}
h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;}
#header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS", Verdana, sans-serif;color:#FFF;
background-color:#555555;}
#content{margin:0 0 0 2%;position:relative;}
.content-container{background:#FFF;width:96%;margin-top:8px;padding:10px;position:relative;}
-->
</style>
</head>
<body>
<div id="header"><h1>Server Error</h1></div>
<div id="content">
<div class="content-container"><fieldset>
<h2>404 - File or directory not found.</h2>
<h3>The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.</h3>
</fieldset></div>
</div>
</body>
</html>
烧瓶
Flask是一个 Python Web 框架。默认的 404 页面如下所示：
来源很简单：
<!doctype html>
<html lang=en>
<title>404 Not Found</title>
<h1>Not Found</h1>
<p>The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.</p>
由此异常生成：
class NotFound(HTTPException):
"""*404* `Not Found`
Raise if a resource does not exist and never existed.
"""
code = 404
description = (
"The requested URL was not found on the server. If you entered"
" the URL manually please check your spelling and try again."
)
使用同一文件get_body中的函数打印该异常：
def get_body(
self,
environ: WSGIEnvironment | None = None,
scope: dict[str, t.Any] | None = None,
) -> str:
"""Get the HTML body."""
return (
"<!doctype html>n"
"<html lang=en>n"
f"<title>{self.code}{escape(self.name)}</title>n"
f"<h1>{escape(self.name)}</h1>n"
f"{self.get_description(environ)}n"
)
姜戈
Django是一个 Python Web 框架。它的 404 页面与Apache和Flask非常相似：
HTML 看起来像：
<!doctype html>
<html lang="en">
<head>
<title>Not Found</title>
</head>
<body>
<h1>Not Found</h1><p>The requested resource was not found on this server.</p>
</body>
</html>
它来自this 函数，如果没有设置 404 模板，则ERROR_PAGE_TEMPLATE使用 thistitle和调用details。
快速API
FastAPI是一个基于 Python 类型提示的 Python Web 框架。当找不到路径时，它会返回 JSON，如下所示：
Firefox 通常会以格式化的方式显示：
AIOHTTP协议
AIOHTTP是“用于 asyncio 和 Python 的异步 HTTP 客户端/服务器”。默认 404 只是代码和文本：
没有 HTML，只有纯文本。它是从web_exceptions.py定义各种异常的文件生成的，包括HTTPNotFound：
class HTTPNotFound(HTTPClientError):
status_code = 404
该类HTTPClientError定义text为：
if text is None:
if not self.empty_body:
text = f"{self.status_code}: {reason}"
status_code设置在文件底部，从http模块中提取：
def _initialize_default_reason() -> None:
for obj in globals().values():
if isinstance(obj, type) and issubclass(obj, HTTPException):
if obj.status_code >= 0:
try:
status = HTTPStatus(obj.status_code)
obj.default_reason = status.phrase
except ValueError:
pass
_initialize_default_reason()
del _initialize_default_reason
我可以在 Python REPL 中生成这些：
oxdf@hacky$python
Python 3.12.3 (main, Sep 11 2024, 14:17:37) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import http
>>> http.HTTPStatus(404)
<HTTPStatus.NOT_FOUND: 404>
>>> http.HTTPStatus(404).phrase
'Not Found'
纤维
Fiber是一个基于 Go 的 Web 框架，默认 404 仅返回包含路径的文本字符串：
文本与Express完全相同，但本例中没有 HTML。
来源很简单：
// If c.Next() does not match, return 404
err := NewError(StatusNotFound, "Cannot "+c.Method()+" "+c.getPathOriginal())
杜松子酒
Gin是另一个基于 Go 的 Web 框架，其中默认的 404 页面也只是文本：
该消息在一行中定义：
var (
default404Body = []byte("404 page not found")
default405Body = []byte("405 method not allowed")
)
PHP-FPM
PHP FastCGI 进程管理器（或 PHP-FPM）是 PHP 实现，用于从 Apache 或 nginx 等网络服务器获取请求并管理进程以处理请求的 URL/页面的 PHP 执行。如果服务器将页面传递给 PHP-FPM，并且找不到该页面，它只会返回文本“文件未找到。n”：
这来自这段代码：
zend_try {
zlog(ZLOG_DEBUG, "Primary script unknown");
SG(sapi_headers).http_response_code = 404;
PUTS("File not found.n");
} zend_catch {
} zend_end_try();
goto fastcgi_request_done;
PHP-FPM 通常位于另一个 Web 服务器（例如 Apache）后面，因此/doesnotexist将返回 Apache 404，但/doesnotexist.php会由 Web 服务器转发到 PHP-FPM，并在 PHP-FPM 中返回 404。
拉维尔
Laravel是一个 PHP Web 框架。默认的 404 页面如下所示：
该页面的 HTML 源代码有点长，因为它包含以下style信息：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Not Found</title>
<style>
/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}a{background-color:transparent}code{font-family:monospace,monospace;font-size:1em}[hidden]{display:none}html{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji;line-height:1.5}*,:after,:before{box-sizing:border-box;border:0 solid #e2e8f0}a{color:inherit;text-decoration:inherit}code{font-family:Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace}svg,video{display:block;vertical-align:middle}video{max-width:100%;height:auto}.bg-white{--bg-opacity:1;background-color:#fff;background-color:rgba(255,255,255,var(--bg-opacity))}.bg-gray-100{--bg-opacity:1;background-color:#f7fafc;background-color:rgba(247,250,252,var(--bg-opacity))}.border-gray-200{--border-opacity:1;border-color:#edf2f7;border-color:rgba(237,242,247,var(--border-opacity))}.border-gray-400{--border-opacity:1;border-color:#cbd5e0;border-color:rgba(203,213,224,var(--border-opacity))}.border-t{border-top-width:1px}.border-r{border-right-width:1px}.flex{display:flex}.grid{display:grid}.hidden{display:none}.items-center{align-items:center}.justify-center{justify-content:center}.font-semibold{font-weight:600}.h-5{height:1.25rem}.h-8{height:2rem}.h-16{height:4rem}.text-sm{font-size:.875rem}.text-lg{font-size:1.125rem}.leading-7{line-height:1.75rem}.mx-auto{margin-left:auto;margin-right:auto}.ml-1{margin-left:.25rem}.mt-2{margin-top:.5rem}.mr-2{margin-right:.5rem}.ml-2{margin-left:.5rem}.mt-4{margin-top:1rem}.ml-4{margin-left:1rem}.mt-8{margin-top:2rem}.ml-12{margin-left:3rem}.-mt-px{margin-top:-1px}.max-w-xl{max-width:36rem}.max-w-6xl{max-width:72rem}.min-h-screen{min-height:100vh}.overflow-hidden{overflow:hidden}.p-6{padding:1.5rem}.py-4{padding-top:1rem;padding-bottom:1rem}.px-4{padding-left:1rem;padding-right:1rem}.px-6{padding-left:1.5rem;padding-right:1.5rem}.pt-8{padding-top:2rem}.fixed{position:fixed}.relative{position:relative}.top-0{top:0}.right-0{right:0}.shadow{box-shadow:0 1px 3px 0 rgba(0,0,0,.1),0 1px 2px 0 rgba(0,0,0,.06)}.text-center{text-align:center}.text-gray-200{--text-opacity:1;color:#edf2f7;color:rgba(237,242,247,var(--text-opacity))}.text-gray-300{--text-opacity:1;color:#e2e8f0;color:rgba(226,232,240,var(--text-opacity))}.text-gray-400{--text-opacity:1;color:#cbd5e0;color:rgba(203,213,224,var(--text-opacity))}.text-gray-500{--text-opacity:1;color:#a0aec0;color:rgba(160,174,192,var(--text-opacity))}.text-gray-600{--text-opacity:1;color:#718096;color:rgba(113,128,150,var(--text-opacity))}.text-gray-700{--text-opacity:1;color:#4a5568;color:rgba(74,85,104,var(--text-opacity))}.text-gray-900{--text-opacity:1;color:#1a202c;color:rgba(26,32,44,var(--text-opacity))}.uppercase{text-transform:uppercase}.underline{text-decoration:underline}.antialiased{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.tracking-wider{letter-spacing:.05em}.w-5{width:1.25rem}.w-8{width:2rem}.w-auto{width:auto}.grid-cols-1{grid-template-columns:repeat(1,minmax(0,1fr))}@-webkit-keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@-webkit-keyframes ping{0%{transform:scale(1);opacity:1}75%,to{transform:scale(2);opacity:0}}@keyframes ping{0%{transform:scale(1);opacity:1}75%,to{transform:scale(2);opacity:0}}@-webkit-keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@-webkit-keyframes bounce{0%,to{transform:translateY(-25%);-webkit-animation-timing-function:cubic-bezier(.8,0,1,1);animation-timing-function:cubic-bezier(.8,0,1,1)}50%{transform:translateY(0);-webkit-animation-timing-function:cubic-bezier(0,0,.2,1);animation-timing-function:cubic-bezier(0,0,.2,1)}}@keyframes bounce{0%,to{transform:translateY(-25%);-webkit-animation-timing-function:cubic-bezier(.8,0,1,1);animation-timing-function:cubic-bezier(.8,0,1,1)}50%{transform:translateY(0);-webkit-animation-timing-function:cubic-bezier(0,0,.2,1);animation-timing-function:cubic-bezier(0,0,.2,1)}}@media (min-width:640px){.sm:rounded-lg{border-radius:.5rem}.sm:block{display:block}.sm:items-center{align-items:center}.sm:justify-start{justify-content:flex-start}.sm:justify-between{justify-content:space-between}.sm:h-20{height:5rem}.sm:ml-0{margin-left:0}.sm:px-6{padding-left:1.5rem;padding-right:1.5rem}.sm:pt-0{padding-top:0}.sm:text-left{text-align:left}.sm:text-right{text-align:right}}@media (min-width:768px){.md:border-t-0{border-top-width:0}.md:border-l{border-left-width:1px}.md:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:1024px){.lg:px-8{padding-left:2rem;padding-right:2rem}}@media (prefers-color-scheme:dark){.dark:bg-gray-800{--bg-opacity:1;background-color:#2d3748;background-color:rgba(45,55,72,var(--bg-opacity))}.dark:bg-gray-900{--bg-opacity:1;background-color:#1a202c;background-color:rgba(26,32,44,var(--bg-opacity))}.dark:border-gray-700{--border-opacity:1;border-color:#4a5568;border-color:rgba(74,85,104,var(--border-opacity))}.dark:text-white{--text-opacity:1;color:#fff;color:rgba(255,255,255,var(--text-opacity))}.dark:text-gray-400{--text-opacity:1;color:#cbd5e0;color:rgba(203,213,224,var(--text-opacity))}}
</style>
<style>
body {
font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
}
</style>
</head>
<body class="antialiased">
<div class="relative flex items-top justify-center min-h-screen bg-gray-100 dark:bg-gray-900 sm:items-center sm:pt-0">
<div class="max-w-xl mx-auto sm:px-6 lg:px-8">
<div class="flex items-center pt-8 sm:justify-start sm:pt-0">
<div class="px-4 text-lg text-gray-500 border-r border-gray-400 tracking-wider">
404 </div>
<div class="ml-4 text-lg text-gray-500 uppercase tracking-wider">
Not Found </div>
</div>
</div>
</div>
</body>
</html>
Laravel 使用此模板来显示错误：
<div class="flex items-center pt-8 sm:justify-start sm:pt-0">
<div class="px-4 text-lg text-gray-500 border-r border-gray-400 tracking-wider">
@yield('code')
</div>
<div class="ml-4 text-lg text-gray-500 uppercase tracking-wider">
@yield('message')
</div>
这个视图扩展了它来设置消息和代码：
@extends('errors::minimal')
@section('title', __('Not Found'))
@section('code', '404')
@section('message', __('Not Found'))
交响乐团
Symfony是另一个具有默认 404 页面的 PHP 框架，如下所示：
原始 HTML 是：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="robots" content="noindex,nofollow,noarchive" />
<title>An Error Occurred: Not Found</title>
<link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 128 128%22><text y=%221.2em%22 font-size=%2296%22>❌</text></svg>" />
<style>body { background-color: #fff; color: #222; font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; margin: 0; }
.container { margin: 30px; max-width: 600px; }
h1 { color: #dc3545; font-size: 24px; }
h2 { font-size: 18px; }</style>
</head>
<body>
<div class="container">
<h1>Oops! An Error Occurred</h1>
<h2>The server returned a "404 Not Found".</h2>
<p>
Something is broken. Please let us know what you were doing when this error occurred.
We will fix it as soon as possible. Sorry for any inconvenience caused.
</p>
</div>
</body>
</html>
它来自这个模板。
表达
Express是一个 JavaScript NodeJS Web 框架。它的 404 页面很短，给出了未找到的路径：
文本与Fiber相同，但 Express 在文本周围包含 HTML：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
</head>
<body>
<pre>Cannot GET /0xdf</pre>
</body>
</html>
下一个JS
NextJS是一个基于React 框架前端和后端 NodeJS构建的框架。 404 页面看起来与Laravel类似：
HTML 位于一行（此处显示为换行）：
<!DOCTYPE html><html><head><style data-next-hide-fouc="true">body{display:none}</style><noscript data-next-hide-fouc="true"><style>body{display:block}</style></noscript><meta charSet="utf-8"/><meta name="viewport" content="width=device-width"/><title>404: This page could not be found</title><meta name="next-head-count" content="3"/><noscript data-n-css=""></noscript><script defer="" nomodule="" src="/_next/static/chunks/polyfills.js"></script><script src="/_next/static/chunks/webpack.js" defer=""></script><script src="/_next/static/chunks/main.js" defer=""></script><script src="/_next/static/chunks/pages/_app.js" defer=""></script><script src="/_next/static/chunks/pages/_error.js" defer=""></script><script src="/_next/static/development/_buildManifest.js" defer=""></script><script src="/_next/static/development/_ssgManifest.js" defer=""></script><noscript id="__next_css__DO_NOT_USE__"></noscript></head><body><div id="__next"><div style="font-family:system-ui,"Segoe UI",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji";height:100vh;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center"><div style="line-height:48px"><style>body{color:#000;background:#fff;margin:0}.next-error-h1{border-right:1px solid rgba(0,0,0,.3)}@media (prefers-color-scheme:dark){body{color:#fff;background:#000}.next-error-h1{border-right:1px solid rgba(255,255,255,.3)}}</style><h1 class="next-error-h1" style="display:inline-block;margin:0 20px 0 0;padding-right:23px;font-size:24px;font-weight:500;vertical-align:top">404</h1><div style="display:inline-block"><h2 style="font-size:14px;font-weight:400;line-height:28px">This page could not be found<!-- -->.</h2></div></div></div></div><script src="/_next/static/chunks/react-refresh.js"></script><script id="__NEXT_DATA__" type="application/json">{"props":{"pageProps":{"statusCode":404}},"page":"/_error","query":{},"buildId":"development","isFallback":false,"gip":true,"scriptLoader":[]}</script></body></html>
它来自这个源头。
雄猫
Apache Tomcat是一个用 Java 构建的 Web 框架，它使用 Java Server Pages (JSP)、Servlet 和 Web Application Archives (WAR) 等技术。它的 404 页面如下所示：
HTML 是一行（此处换行显示）：
<!doctype html><html lang="en"><head><title>HTTP Status 404 – Not Found</title><style type="text/css">body {font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b {color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 404 – Not Found</h1><hr class="line" /><p><b>Type</b> Status Report</p><p><b>Message</b> /doesnotexist</p><p><b>Description</b> The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.</p><hr class="line" /><h3>Apache Tomcat/9.0.31 (Ubuntu)</h3></body></html>
错误文本设置在这里：
http.404.desc=The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
http.404.reason=Not Found
春季启动
Spring Boot是一个 Java Web 框架，用于创建基于 Spring 的 Web 应用程序。 404页面如下所示：
原始 HTML 是一行（此处显示为换行）：
<html><body><h1>Whitelabel Error Page</h1><p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p><div id='created'>Wed Sep 25 12:55:53 UTC 2024</div><div>There was an unexpected error (type=Not Found, status=404).</div><div></div></body></html>
生成此内容的来源位于ErrorMvcAutoConfiguration.java 此处：
builder.append("<html><body><h1>Whitelabel Error Page</h1>")
.append("<p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p>")
.append("<div id='created'>")
.append(timestamp)
.append("</div>")
.append("<div>There was an unexpected error (type=")
.append(htmlEscape(model.get("error")))
.append(", status=")
.append(htmlEscape(model.get("status")))
.append(").</div>");
if (message != null) {
builder.append("<div>").append(htmlEscape(message)).append("</div>");
}
if (trace != null) {
builder.append("<div style='white-space:pre-wrap;'>").append(htmlEscape(trace)).append("</div>");
}
builder.append("</body></html>");
码头
Jetty是另一个 Java Web 框架，其 404 页面如下所示：
HTML 看起来像：
<!DOCTYPE html>
<html lang="en">
<head>
<title>Error 404 - Not Found</title>
<meta charset="utf-8">
<style>body { font-family: sans-serif; } table, td { border: 1px solid #333; } td, th { padding: 5px; } thead, tfoot { background-color: #333; color: #fff; } </style>
</head>
<body>
<h2>Error 404 - Not Found.</h2>
<p>No context on this server matched or handled this request.</p>
<p>Contexts known to this server are:</p>
<table class="contexts"><thead><tr><th>Context Path</th><th>Display Name</th><th>Status</th><th>LifeCycle</th></tr></thead><tbody>
</tbody></table><hr/>
<a href="https://jetty.org"><img alt="icon" src="/favicon.ico"/></a> <a href="https://jetty.org">Powered by Eclipse Jetty:// Server</a><hr/>
</body>
</html>
这是在此代码中生成的。
红宝石 on Rails
Ruby on Rails是一个 Ruby Web 框架，其 404 页面如下所示：
HTML 很长，因为它包含 CSS 信息：
<!DOCTYPE html>
<html>
<head>
<title>The page you were looking for doesn't exist (404)</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<style>
.rails-default-error-page {
background-color: #EFEFEF;
color: #2E2F30;
text-align: center;
font-family: arial, sans-serif;
margin: 0;
}
.rails-default-error-page div.dialog {
width: 95%;
max-width: 33em;
margin: 4em auto 0;
}
.rails-default-error-page div.dialog > div {
border: 1px solid #CCC;
border-right-color: #999;
border-left-color: #999;
border-bottom-color: #BBB;
border-top: #B00100 solid 4px;
border-top-left-radius: 9px;
border-top-right-radius: 9px;
background-color: white;
padding: 7px 12% 0;
box-shadow: 0 3px 8px rgba(50, 50, 50, 0.17);
}
.rails-default-error-page h1 {
font-size: 100%;
color: #730E15;
line-height: 1.5em;
}
.rails-default-error-page div.dialog > p {
margin: 0 0 1em;
padding: 1em;
background-color: #F7F7F7;
border: 1px solid #CCC;
border-right-color: #999;
border-left-color: #999;
border-bottom-color: #999;
border-bottom-left-radius: 4px;
border-bottom-right-radius: 4px;
border-top-color: #DADADA;
color: #666;
box-shadow: 0 3px 8px rgba(50, 50, 50, 0.17);
}
</style>
</head>
<body class="rails-default-error-page">
<!-- This file lives in public/404.html -->
<div class="dialog">
<div>
<h1>The page you were looking for doesn't exist.</h1>
<p>You may have mistyped the address or the page may have moved.</p>
</div>
<p>If you are the application owner check the logs for more information.</p>
</div>
</body>
</html>
该模板在此处定义。
西纳特拉
Sinatra是一个 Ruby Web 应用程序框架，其 404 页面如下所示：
它显示失败的路径（在本例中/0xdf）并建议向 Ruby 文件添加哪些内容以使该路径存在。
HTML 看起来像：
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
body { text-align:center;font-family:helvetica,arial;font-size:22px;
color:#888;margin:20px}
#c {margin:0 auto;width:500px;text-align:left}
</style>
</head>
<body>
<h2>Sinatra doesn’t know this ditty.</h2>
<img src='http://10.10.11.253:3000/__sinatra__/404.png'>
<div id="c">
Try this:
<pre>get '/0xdf' do
"Hello World"
end
</pre>
</div>
</body>
</html>
它来自这个源头。
ASP.NET 核心
ASP.NET Core是一个基于 .NET 构建的跨平台 Web 框架，尽管它通常出现在 Windows 主机上。默认的 404 页面如下所示：
原始 HTML 是：
<!DOCTYPE html>
<html>
<head>
<title>The resource cannot be found.</title>
<meta name="viewport" content="width=device-width" />
<style>
body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt}
.marker {font-weight: bold; color: black;text-decoration: none;}
.version {color: gray;}
.error {margin-bottom: 10px;}
.expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }
@media screen and (max-width: 639px) {
pre { width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; }
}
@media screen and (max-width: 479px) {
pre { width: 280px; }
}
</style>
</head>
<body bgcolor="white">
<span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>
<h2> <i>The resource cannot be found.</i> </h2></span>
<font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">
<b> Description: </b>HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
<br><br>
<b> Requested URL: </b>/default.aspx<br><br>
</body>
</html>
ASP.NET 应用程序通常托管在 IIS 等 Web 服务器后面，因此/doesnotexist可能会导致 IIS 404，其中/doesnotexist.aspx可以路由到 ASP.NET，并在其中返回 ASP.NET 404 页面。
原文始发于微信公众号（守护安全团队）：黑客攻击的东西~默认 404 页面
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