Practical guides for webmasters — DNS, SEO, security, and site maintenance.
Every redirect answers two questions. Is this move permanent, and may the browser turn a POST into a GET? Most redirect bugs come from answering only the first.
SPF and DKIM each vouch for a domain. DMARC asks whether it is the domain your reader actually sees, and that question is where legitimate mail gets blocked.
They answer three different questions, and the classic mistake — blocking a page in robots.txt to deindex it — does the exact opposite.
Nothing breaking is the thing you are paid for, and it looks identical to nothing happening. The update screen is the only evidence the work occurred.
og:image isn't one setting. It's a negotiation with a dozen crawlers that each fetch differently, cache separately, and forgive nothing.
"My domain is down" is really three separate questions with three separate tools. Knowing which one you are asking is most of the fix.
Base64 is not a lock. SHA-256 is the wrong way to store a password. Three operations turn text into other text, and confusing them causes real breaches.
