Conditional Headers
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="proxy.php?url=https%3A%2F%2Fstatuscodefyi.com%2Fiframe%2Fglossary%2Fconditional-header%2F" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://statuscodefyi.com/glossary/conditional-header/Add a dynamic SVG badge to your README or docs.
[](https://statuscodefyi.com/glossary/conditional-header/)Use the native HTML custom element.
HTTP headers (If-Match, If-None-Match, If-Modified-Since, If-Unmodified-Since, If-Range) that make requests conditional on resource state, enabling efficient caching and concurrency control.