What is a conditional HTTP request?
Learn how conditional requests validate cached content or help prevent an update from overwriting a resource that has changed.
Read the guide 4 min read
GEEZ AT WORK
Technology & devices
Questions, practical answers, and useful follow-ups to help you work through the details.
Latest guides
Showing 49–72 of 845 guides
How does If-None-Match help check whether a cached response is still current?
Follow a conditional request from a stored ETag through a 304 response, and see what the client can reuse—and what depends on server support.
Read the guide 4 min read
How can you tell whether an HTTP response contains JSON?
Check the response’s Content-Type, then parse the body with error handling; a successful status alone does not confirm JSON.
Read the guide 4 min read
When should a space in a URL be percent-encoded?
A practical reference for representing spaces in URL paths and query values, including when `%20` or `+` is appropriate.
Read the guide 4 min read
How should repeated query parameter names be represented in an HTTP URL?
Compare possible formats for multiple values, then check the API contract so your request matches what the endpoint expects.
Read the guide 4 min read
How can a client tell whether an HTTP response is successful?
Classify the exact HTTP status code, distinguish receipt from completion, and record what the response actually confirms.
Read the guide 4 min read
What do common 5xx HTTP responses tell an API client?
Learn what 500, 502, 503, and 504 communicate—and how to inspect an API response without guessing at its cause or retrying blindly.
Read the guide 4 min read
How should an API client interpret common 4xx status codes?
Use common 4xx responses to choose a sensible next diagnostic question, while checking your API’s own documentation for application-specific behavior.
Read the guide 5 min read
What is the difference between an HTTP request header and a response header?
See which side sends each HTTP header, how to read a labeled request-and-response example, and why a header’s message matters more than its name.
Read the guide 4 min read
How can I show that a control is in a pressed or selected state?
Keep a control’s visible appearance and programmatic state aligned, and distinguish persistent selection from brief focus or click styling.
Read the guide 5 min read
How can I make a date picker work without pointer input?
Review keyboard movement, date selection, dialog behavior, and a text-entry alternative so the calendar isn’t the only way to enter a date.
Read the guide 5 min read
How can I make an autocomplete field usable with a keyboard?
Specify how people move through suggestions, accept or dismiss them, and keep typing, then test each behavior with clear states.
Read the guide 5 min read
How can I make a progress bar’s value and label meaningful?
Choose a clear name, show a value only when progress is measurable, and handle updates and completion distinctly.
Read the guide 4 min read
How can I display an inline notification that users can dismiss by keyboard?
Plan a keyboard-reachable dismiss control, a clear focus destination when the notice disappears, and a practical review checklist.
Read the guide 5 min read
How can I keep a focused control visible in a scrollable panel?
Test focus visibility inside nested scroll areas, check fixed overlays, and confirm keyboard users can reach both the panel and the surrounding page.
Read the guide 5 min read
How can I prevent CSS from hiding keyboard-focusable content?
Review hidden and clipped states alongside keyboard navigation so interactive content is neither invisible while focused nor skipped when it should be available.
Read the guide 4 min read
How can I validate a form without blocking users who need to correct errors?
Plan when to validate, how to explain errors, and how to return users to a form with their entered information intact.
Read the guide 5 min read
How can I make a website work when users override text colors?
Review interactive controls under user-selected colors so labels, boundaries, focus, and state cues remain understandable.
Read the guide 5 min read
How can I make a custom data grid keyboard accessible?
Choose a semantic table or interactive grid, then define predictable keyboard movement between cells and controls before implementation.
Read the guide 5 min read
How can I show which column is focused or selected in a data grid?
Separate keyboard focus from selected columns with distinct visual treatments, then check both states across keyboard interactions.
Read the guide 5 min read
How can I make a sortable data table’s column controls understandable?
Name each sortable column clearly, make the active direction understandable without its arrow or color, and review the control’s announced state.
Read the guide 5 min read
How can I support keyboard navigation in a single-page website?
Plan where keyboard focus goes after a view change, identify the new view clearly, and test both direct visits and in-app navigation.
Read the guide 5 min read
How can I stop a sticky header from hiding the focused page control?
Use keyboard and in-page-link checks to find when a sticky header covers a target, then adjust spacing or scrolling and retest responsive layouts.
Read the guide 4 min read
How can I build a website menu that works with both keyboard and pointer?
Choose a navigation list or an application-style menu based on what it does, then test the intended tasks with both keyboard and pointer.
Read the guide 5 min read
YOUR QUESTION. YOUR DETAILS.
Let’s work through your situation.
Get a tailored answer or help with your next task. Starts at $1, with a quote before you pay.