starts_with

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