What is the syntax for URL query parameters?

Query parameters are key=value pairs tacked onto the URL after a ? and joined by &.

Format:

/path?key1=value1&key2=value2

Example:

GET /customer?first=John&last=Doe HTTP/1.1

Breakdown:

• ? - Starts the query string
• first=John - First parameter (key=value)
• & - Separator between parameters
• last=Doe - Second parameter

URL encoding: Special characters must be encoded:

• Space → %20 or +
• & → %26
• = → %3D

Example with encoding:

/search?q=hello%20world&lang=en