MIME Types

.json

REST API bodies, webhook payloads, configuration files, GraphQL responses

HTML form submissions, OAuth 2.0 token requests, legacy API endpoints

.bin .exe .dll .deb .dmg

File download endpoints, binary API payloads, unknown binary data

.pdf

Invoice generation, report downloads, document serving endpoints

.jsonld

Google structured data in HTML, ActivityPub federation, semantic web APIs

.xml

SOAP web services, XML APIs, RSS/Atom feeds, configuration files

GraphQL HTTP API responses (modern servers)

.zip

Archive downloads, bulk export endpoints, dependency bundles

.wasm

WebAssembly module delivery for browser applications

.msgpack

Binary API endpoints as alternative to application/json

.cbor

FIDO2/WebAuthn credential responses, CoAP IoT payloads, COSE objects

.html .htm

Web pages served by HTTP servers

.txt .log .md

Plain text files, log output, robots.txt, llms.txt, README files

.css

CSS stylesheets served to browsers

.js .mjs

JavaScript files served to browsers, ES module imports

.csv

Data export endpoints, report downloads, spreadsheet generation

Server-Sent Events (SSE) connections, LLM token streaming, real-time dashboards

.jpg .jpeg

Photographs, product images, social media previews

.png

Logos, icons, UI screenshots, transparent images

.webp

Modern web images served to browsers, CDN-optimized image delivery

.svg

Icons, logos, illustrations, charts, UI elements that need to scale

.avif

Modern web images where maximum compression quality matters, CDN static assets

.gif

Legacy animated images, social platform animations (Tenor, Giphy)

File upload forms, API endpoints accepting file uploads

HTTP range requests for video streaming, partial download resumption

.mp3

Music streaming, podcast serving, audio file downloads

.mp4 .m4v

Web video, video streaming, replacing animated GIFs

.woff2

Web font delivery via CSS @font-face