Web Explained
A 304 Response Can Mean Your Cached Copy Is Still Usable
Read HTTP 304 as part of a conditional request rather than assuming that every response without a new page body is a failed download.
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Files & Formats
Wrong Characters in a Text File May Be an Encoding Problem
When readable text becomes strange symbols, distinguish character encoding from font choice and preserve the original file before trying a different interpretation.
Web Explained
A 401 and a 403 Point to Different Access Problems
Understand the intended difference between HTTP 401 and 403, then collect the right details before asking a site owner for help with access.
Web Explained
Reader View Simplifies a Page, So Check the Original When Context Matters
Browser Reader View can make an article easier to read, but it changes the presentation. Return to the original page for surrounding controls, captions or information you cannot find.
Files & Formats
A CSV Opens in One Column? Check the Separator in the Preview
A text file may need its separator and text qualifier interpreted during import. Use a preview to check columns before changing the original CSV.
Files & Formats
A File Hash Checks Content, Not Whether You Should Trust It
A SHA-256 hash helps compare a downloaded file with a trusted reference. Matching values do not establish that the software is useful, legitimate or harmless.
Web Explained
Find on This Page Does Not Search the Whole Website
Browser Find is useful for locating words on the current page. Learn when to use it, when to switch to site search, and what a no-match result can actually tell you.
Files & Formats
A PDF Can Show Words Without Having Searchable Text
A scanned page can look readable while search finds nothing. Understand the image and text layers, then check OCR results against the visible page.