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Kenneth Lum
Kenneth Lum

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To tell what the web server is, right inside of a webpage

Sometimes if we start a local webserver, or if we use other online pages, we would like to find out what webserver it is, and it is possible to do it right inside of the webpage. We can fetch something, and look at the response header by res.headers.get("Server"):

fetch("foo.txt").then((res) => {
  ).innerHTML = `The server is ${JSON.stringify(res.headers.get("Server"))}`;
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The server for

Webserver in the header
Node.js's live-server nothing (null)
Ruby's ruby -run -e httpd . -p 8080 WEBrick/1.4.2 (Ruby/2.6.3/2019-04-16)
Python 2's python -m SimpleHTTPServer 8080 SimpleHTTP/0.6 Python/2.7.16
Python 3's python3 -m http.server 8080 SimpleHTTP/0.6 Python/3.8.2
JSFiddle nginx
Codesandbox cloudflare
macOS Big Sur's webserver Apache/2.4.46 (Unix)

It is possible to tell the user-agent as well, using navigator.userAgent.

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