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HTML / CSS / JS

# --- GET: read, safe, idempotent, cacheable ---
GET /users/42 HTTP/1.1
Host: api.example.com
Accept: application/json
# Response: 200 OK + user object

# --- POST: create, not safe, not idempotent ---
POST /users HTTP/1.1
Content-Type: application/json
{ "name": "Bob", "email": "bob@example.com" }
# Response: 201 Created
# Location: /users/101

# --- PUT: full replace, idempotent ---
PUT /users/42 HTTP/1.1
Content-Type: application/json
{ "name": "Alice Updated", "email": "alice@new.com", "role": "admin" }
# All fields must be supplied; missing fields are set to null
# Response: 200 OK + updated object  (or 204 No Content)

# --- PATCH: partial update ---
PATCH /users/42 HTTP/1.1
Content-Type: application/json
{ "email": "alice@newer.com" }
# Only the supplied fields change
# Response: 200 OK + updated object

# --- DELETE ---
DELETE /users/42 HTTP/1.1
# Response: 204 No Content  (no body)
# Second DELETE: 404 Not Found

# --- HEAD: like GET but no body (check existence/headers) ---
HEAD /users/42 HTTP/1.1
# Response: 200 OK, headers only

# --- OPTIONS: discover allowed methods (CORS preflight) ---
OPTIONS /users HTTP/1.1
# Access-Control-Allow-Methods: GET, POST, OPTIONS