Rewrite

Rewriting is one of Reqable's core debugging features, which automatically modifies requests or responses through preset rules. Reqable's rewriting supports 5 modes: Redirection, Replace Request, Replace Response, [Modify Request](#modify- req) and [Modify Response] (#modify-res).

Rewrite can be enabled or disabled in four ways:

• Click directly on the rewrite icon
• Right click on the rewrite icon -> Enable/Disable
• Tray -> Rewrite -> Enable/Disable
• Shortcut key Shift + Control + K

When the rewrite is enabled, the rewrite icon on the QuickBar will turn green and active.

Create Rewrite

There are six ways to create a rewrite rule:

• Right click on the rewrite icon -> Add Rewrite
• Tray -> Rewrite ->Add Rewrite
• Rewrite List -> Click the + icon in the upper right corner
• Rewrite List -> Right-Click Menu -> New
• Traffic list -> Select a item -> Right-click menu -> Rewrite
• Shortcut key Shift + Alt + G

Enter the rule name and matching URL, the URL supports wildcard * and ? matching. Finally set an rewriting behavior. Reqable supports the following five rewriting behaviors.

Redirection

Compared with Mirror, rewrite redirection provides more fine-grained operation, for example, the request A: https://hello.com/foo, can be redirected to request B: https://hello.com/bar.

The picture above is the redirection edit page, there are a few points to note:

• Reserve host in headers When requesting a new URL address, whether to keep the Host value of the request header as the original address. It is generally not recommended to enable this option. Different server frameworks have different processing logic for Host, which may cause request failure.
• Directory Match If the new URL address ends with /*, it means match the subdirectory of the original address.
• Exclude URL This is optional, and can be configured when the redirected URL needs to be excluded.

The following is an example of redirection, if we need to set a redirection for the following URL:

https://hello.com/foo/bar/ok?abc=123

redirected to

https://world.com/new/*

Then the actual redirected URL is

https://world.com/new/foo/bar/ok?abc=123

danger

Under the implementation of the current version, if the server address of the original request cannot accessed, the request will directly fail (that is, no redirection request will be initiated). In addition, redirection does not block the request sent to the original address server, but actually just replaces the response data of the original address server.

Replace Request

This rewriting behavior means to directly replace the request data, supports method, path, headers and body.

Tips

When creating a rewrite rule from the right-click menu of the traffic list, the request data will be automatically filled in, and we only need to modify it slightly.

Replace Method and Path

No matter what the original request method and path are, it will be replaced with the preset request method and path.

Replace Request Headers

Whatever the original request headers are, it will be replaced with the preset request headers.

About Content-Length

Regardless of whether there is a preset Content-Length, the final Content-Length value will be automatically recalculated. So there is no need to care about Content-Length when replacing the header.

Replace Request Body

Whatever the original request body is, it will be replaced with the preset request body.

Reqable supports preset three body types: empty, text and local file.

Replace Response

This rewriting behavior means to directly replace the response data, supports status code, headers and body.

Replace Status Code

Whatever the original response status is, it will be replaced with the preset response status.

Replace Response Headers

See Replace Request Headers

Replace Response Body

See Replace Request Body

Modify Request

Compared with Replace Request, this behavior provides a more detailed modification strategy. For example, delete query parameters, modify an item in the request header, and replace the content of the request body with regex.

For example, with the following request parameters, we want to modify the key value to 54321, but keep other parameters unchanged.

https://reqable.com?key=12345&foo=bar&hello=world

Now you only need to create a key matching replacement rule.

If it is more complicated, we don't know the specific value of the key, but we still want to replace it with 54321, we can use regular expressions.

To make it more complicated, if we want to add a prefix api- to the original key value, we can use regular expressions and $ group replacement.

A request can create and apply multiple modification rules, which we can manage in the list.

caution

• This behavior does not support modifying the request method and path.
• Do not modify the value of the request header Content-Length, because the final value of Content-Length will be automatically recalculated.

Modify Response

Same as Modify Request.

caution

• This behavior does not support modifying the response status code.
• Do not modify the value of the request header Content-Length, because the final value of Content-Length will be automatically recalculated.

Order of Execution

A request or response can be rewritten multiple rules (by creating different rules to match the same url), which will inevitably involve the issue of execution sequence. We can adjust the order in the list of rewriting rules (shortcut key Control + ↓/↑) to set the priority, and the first one in the list will be executed first.

Import and Export

Reqable supports batch import and export of rewrite rules, which is convenient for sharing and collaboration with others.