len

The len() function returns the length of the provided argument.

Syntax

len(value)

Parameters

• value: The value to measure the length of. This can be a field name, bytes, array, or map.

Return Value

Returns an integer representing the length of the provided value.

Example

len(http.request.uri) // Returns the length of the request URI
len(http.request.headers["User-Agent"]) // Returns the length of the User-Agent header

Use Cases

• Checking the length of request URIs to prevent overly long URLs
• Validating input lengths in request parameters
• Determining the size of request headers or body