What HTTP code do you get if an SSL has expired?

Question

I have a custom monitor code setup. I need to check if the specified URL has its SSL certificate expired. Is there a specific HTTP code for this? For example:

(async() => {
    const res = await fetch('http://example.com');
    // Or `statusText`
    if (res.status == some_ssl_expiryCode) {
        console.log('SSL expired!');
    }
})();

Is there a way to do this in javascript?

No code. The connection might not even get established between client and server. — Jasen, Feb 09 '22 at 23:46
So do I check for errors, like putting in a try-catch block or checking if the promise was rejected? — K.K Designs, Feb 10 '22 at 00:00
See the responses here https://stackoverflow.com/questions/2604399/is-there-a-way-to-get-ssl-certificate-details-using-javascript — Jasen, Feb 10 '22 at 00:24
@Jasen I've seen other services do this, how do they do this? — K.K Designs, Feb 10 '22 at 02:25

score 2 · Accepted Answer · edited Jan 01 '23 at 02:02

As @Jasen said, the connection doesn't reach the server. The fetch request returns the error CERT_HAS_EXPIRED or CERT_INVALID. It does not produce an HTTP code. See the javascript code below.

fetch('https://example.com/')
    .then(res => res.text())
    .then(() => { /* Do something if success */ })
    .catch(error => {
        console.error(error);
        if (error.code === 'CERT_HAS_EXPIRED') {
            // Certificate has expired
        } else if (error.code === 'CERT_INVALID') {
            // Certificate is invalid
        }
    });

score 1 · Answer 2 · answered Feb 10 '22 at 14:26

1

The client application receives an HTTP 400 - Bad request response with the message "The SSL certificate error".

answered Feb 10 '22 at 14:26

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No it does not. – Bergi Jan 01 '23 at 02:01

What HTTP code do you get if an SSL has expired?

2 Answers2