Web Explained
Content-Encoding Describes a Transformation Applied to the Response
A response can carry HTML while also declaring gzip or another content encoding. Those labels describe different layers: what the content is and how it has…
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Web Explained
Accept-Language Is a Preference Signal, Not Proof of Where Someone Lives
A website can receive language preferences from a browser, but those preferences do not establish the visitor’s nationality or location. Understanding the…
Web Explained
A Responsive Picture Can Use a Different Image on a Narrow Screen
A photograph on a phone may show a tighter composition than the version on a desktop page. A website can deliberately offer different image sources instead…
Web Explained
A 206 Response Can Be a Successful Request for Part of a File
Partial Content sounds like a download has gone wrong, but HTTP status 206 can mean the server successfully supplied the specific portion the client…
Web Explained
A Collapsed Details Box Can Contain Text Already in the Page
Understand a basic HTML disclosure box and distinguish expanding existing content from assuming a button must fetch a new page.
Files & Formats
A Server Can Suggest Downloading a File Instead of Displaying It
Learn what Content-Disposition contributes to a download response and why a suggested filename is different from proof of a file’s contents.
Web Explained
A HEAD Request Checks Headers Without Downloading the Response Body
Distinguish HTTP HEAD from GET when reading a diagnostic result, and avoid treating a successful header check as a full page rendering test.
Web Explained
A 429 Response Asks You to Check Request Limits
Understand HTTP 429 as a rate-limiting response and look for retry guidance instead of repeatedly refreshing a service that is already limiting requests.