GuideRewrite & network

Rewrite action

Let the real request go out and rewrite only the parts you configure — declaratively or with hooks.

The Rewrite action sends the real request and rewrites only the parts you configure — the page still talks to the real backend, which is what you want when a proxy or a shared dev server is the target. Two modes exist and they are mutually exclusive.

Declarative rewrite

Target	What you can do
URL	Find & replace groups; the find part is a literal or a regex, the replacement can reference capture groups with `$1`, `$2`…
Query params	Add, replace or remove entries by name.
Request headers	Set lines of header names and values.
Request body	Find & replace groups, applied in order.
Response headers	Same as request headers, on the way back.
Response body	Find & replace groups, applied in order.

Declarative rewrite is available on the Free plan.

Groups are applied in the order they are listed. Each group can be a plain literal (fast, no escaping) or a regex with $1-style capture references — enable Regex on the group to use the latter.

Hooks

Hook mode runs your code instead. A request hook can change url, headers and body; a response hook can change status, statusText, headers and body. The function body receives a single context argument; return only the fields to change — everything you omit keeps its original value. Both hooks can be used together, and context.req in the response hook already includes the request-hook changes.

Request hook js

// context.req — { url, method, headers, query, body, params }
// Only url / headers / body are read from the return value
return {
  headers: { ...context.req.headers, 'x-env': 'test' },
};

Response hook js

// context.res — { status, statusText, headers, body } (body parsed when JSON)
// context.req — request context, request-hook changes included
// context.loadFaker() — loads Faker (en / fr / de / ru)
return {
  headers: { ...context.res.headers, 'x-mocked-by': 'mockrew' },
};

Fields outside the documented whitelist (method, query, params for requests; anything but status / statusText / headers / body for responses) are ignored — change the URL instead of the method, and use the query table for parameters.

Each group is one find/replace pair; groups are applied top to bottom.

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