starts_with

The starts_with() function checks if a given value starts with a specified prefix.

Syntax

starts_with(value, prefix)

Parameters

• value: The value to check (field name, bytes)
• prefix: The prefix to match against (literal bytes)

Return Value

Returns a boolean value: true if the value starts with the specified prefix, false otherwise.

Example

starts_with(http.request.uri.path, "/api/") // Checks if the URI path starts with "/api/"

Use Cases

• Routing requests based on URL path prefixes
• Identifying specific types of requests or resources
• Implementing path-based access control