LOON TOOL3.5.1 (978)+

Rewrite Builder

Combine conditions and actions visually, then copy the generated Rewrite syntax.

Read the syntax guide →Generated locally in your browser; no configuration is uploaded

Load example

Set match conditions

Choose built-in variables or plugin arguments and combine them with AND / OR.

Match logic

Run when all conditions match

FieldOperatorMatch valueRegular expression

Save capture (optional)

AND

FieldOperatorValue typeComparison value

THEN

Add actions

Multiple actions run from top to bottom.

Actionrequest.header.set

Header nameHeader value

THEN

Actionrequest.header.delete

Header name

OUTPUT

Generated configuration

Syntax ready

2Conditions

0Groups

2Action

rewrite.confhttp-request

http-request if ${url} ~= /^https:\/\/api[.]example[.]com/ && ${request.method} == "POST" then request.header.set(name="X-Loon", value="true") | request.header.delete(name="Cookie")

Include the `[Rewrite]` section heading

The builder does not run Rewrite. Load the copied configuration in Loon and check the runtime log.