Archive for the ‘Internet protocol suite’ Category
Posted by jpluimers on 2026/08/26
Likely what I want is not possible because of CORS or CSP (both security features, often mixed up in writings), but just in case below are some links I found.
The problem at hand was that I wanted to use the functionality of a site like [Wayback/Archive] Redirect Checker | Check your Statuscode 301 vs 302, but on the client side because sometimes redirects depend on locality (for example, but not limited to, AliExpress sites).
Thinks like these fail with CSP errors like Refused to connect to 'https://t.co/Ui4Wmesq1j' because it violates the following Content Security Policy directive: "connect-src chrome://resources chrome://theme 'self'".:
var xhr = new XMLHttpRequest();
xhr.onload = function() {
if (this.status < 400 && this.status >= 300) {
console.log('request redirects to ' + this.getResponseHeader("Location"));
} else {
console.log('request does not redirect');
}
}
xhr.open('HEAD', 'https://t.co/Ui4Wmesq1j', true);
xhr.send();
Links – many of them mentioning CORS, but few CSP:
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Posted in Communications Development, Development, HTTP, Internet protocol suite, Software Development, TCP, Web Development | Tagged: 1656, 2062, 763 | Leave a Comment »
Posted by jpluimers on 2026/04/15
Most of the links from my blog get accompanied with Wayback or Archive.today links, but some don’t.
For those, I need to find a broken/404 link checker which I already hinted at in scr.im « Share your email in a safe way. Get less spam.
Some links that hopefully help me:
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Posted in Development, HTTP, Internet protocol suite, Power User, Software Development, TCP, Web Development | Leave a Comment »
Posted by jpluimers on 2026/01/06
Everytime when installing a pfSense router from scratch, I seem to re-learn a few of the below quirks. So it was finally time to document them (:
Quite a few of my pfSense configurations are just doing routing between various networks, should not provide DHCP leases and do not always need or have a WAN connected (i.e. they are LAN-only).
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Posted in Communications Development, Conference Topics, Conferences, Cyberchef, Development, DHCP, Encoding, Event, Hardware, HTTP, Internet protocol suite, MikroTik, Network-and-equipment, pfSense, Power User, routers, Software Development, SSH, TCP, TLS, UDP | Tagged: 8846 | Leave a Comment »
Posted by jpluimers on 2026/01/01
Cool, since I switched to Let’s Encrypt a long while ago, I missed that various tools now require TLS expiration be no longer than 398 days away (and preferably even 397 days).
So I also missed the reason for that specific number of days. [Wayback/Archive] ssl – Why was 398 days chosen for TLS expiration? – Stack Overflow (thanks [Wayback/Archive] stevendesu and [Wayback/Archive] user10063)
answers it:
366+31+1 = 398 days
It equals one leap year + one month + “a little room to handle the messiness of dates.”
then posts a lot of quotes from references to the history on how that reason came to be. I have archived and listed the links below.
Most of the discussion was during a very hectic time in life: after a single sided bad accident my mentally retarded brother was in and assisting him during his recovery period, I developed cancer and had extensive treatments against it. All the more reason for missing all this:
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Posted in Communications Development, Development, Encryption, https, HTTPS/TLS security, Internet protocol suite, Let's Encrypt (letsencrypt/certbot), Power User, Security, TCP, TLS | Tagged: 138, 195 | Leave a Comment »
Posted by jpluimers on 2025/12/26
Anxious to see how many routers have improved their algorithms to prevent Bufferfloat.
[Wayback/Archive] Bufferbloat, The Internet, And How To Fix It | Hackaday
The following YouTube videos in it are embedded below the blog signature:
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Posted in Communications Development, Development, Internet protocol suite, LifeHacker, Network-and-equipment, Power User, routers, TCP, UDP | Tagged: bufferbloat, latency, jitter, WiFi, Linux, OpenWRT | Leave a Comment »
Posted by jpluimers on 2025/12/10
A while ago I got an error 103 using both Beyond Compare. That did not whos the connection log or error reason, but WinSCP did: it mentioned unexpected output during the logon.
I got reminded that I had already solved this error before via [Wayback/Archive] SSH login works but SFTP login doesn’t – Server Fault (thanks [Wayback/Archive] qreon and [Wayback/Archive] Paulus):
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Posted in *nix, *nix-tools, bash, bash, Beyond Compare, Communications Development, Development, Internet protocol suite, Power User, Scripting, SFTP, Software Development, SSH, TCP, Windows, WinSCP | Leave a Comment »
The Wiert Corner - irregular stream of stuff 