Express server causes error "This site can’t provide a secure connection localhost sent an invalid response"

Question

I'm trying to make a simple hello world kind of server using Express. Here goes my code:

const express = require("express"); const app = express(); app.get("/",function(request, response){//what to do when someone make get request to the homepage or route console.log(request); response.send("hello"); }); app.listen(3000, function(){ console.log("server is listening at port 3000"); });

When I run the program I see this at the command prompt:

server is listening at port 3000

But when I'm accessing it through a browser i.e. https://localhost:3000, I'm getting an error:

This site can’t provide a secure connection localhost sent an invalid response. Try running Windows Network Diagnostics. ERR_SSL_PROTOCOL_ERROR

I expect the browser to see hello as per my method, above, response.send("hello")

ERR_SSL_PROTOCOL_ERROR means SSL gives you a green lock at the top left side of address bar, you can't do that with localhost, it's the s in http(s) — 0xAnon
– 0xAnon, Commented Nov 1, 2019 at 11:17
although you can still generate SSL for localhost , but you don't need it, just request http://localhost:3000 — 0xAnon
– 0xAnon, Commented Nov 1, 2019 at 11:17

fishcakes · Accepted Answer · 2019-11-01 10:56:05Z

29

You need to access it through the HTTP protocol instead. try to connect to http://localhost:3000 instead of https://localhost:3000.

answered Nov 1, 2019 at 10:56

fishcakes

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1 Comment

Amrendra Over a year ago

If changing to http does not work for you: in chrome, go to url: chrome://net-internals/#hsts Under Delete domain security policies enter localhost or your problem domain and click the delete button on screen Then retry with changing https to http.

dankobgd · Accepted Answer · 2019-11-01 11:11:32Z

Basically what app.listen does is that it creates an http server and listens on it, so you have to use http protocol to access it and not https.

This is the source code for app listen taken from express: app.listen

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