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jsPrepend ​

Inserts the specified content before the existing response body. (This only works for responses with content-type containing javascript and a status code containing a body (e.g., 200/500).)

⚠️ Note: Requests without a body, such as 204 and 304 responses, are not affected.

Rule Syntax ​

txt
pattern jsPrepend://value [filters...]
ParametersDescriptionDetailed Documentation
patternAn expression to match against the request URLMatch Pattern Documentation
valueText or binary content. Supports the following types:
• Directory/File Path
• Remote URL
• Inline/Embedded/Values Content		Operation Instruction Documentation
filtersOptional filters. Supports matching:
• Request URL/Method/Headers/Content
• Response Status Code/Headers		Filter Documentation

Configuration Example ​

Inline Method ​

txt
www.example.com/path1 jsPrepend://(Hello) file://(-test-)
www.example.com/path2 jsPrepend://(Hello) file://(-test-) resType://js
www.example.com/path3 jsPrepend://(Hello) file://(-test-) resType://css
  • Request https://www.example.com/path1/to. The response content becomes
    html
    <!DOCTYPE html>
<script>Hello</script>-test-
  • Request https://www.example.com/path2/to. The response content becomes Hello-test-
  • Request The response content of https://www.example.com/path3/to becomes -test-

Embedded/Values Method ​

txt
``` body.txt
Hello world.
```
www.example.com/path1 jsPrepend://{body.txt} file://(-test-)
www.example.com/path2 jsPrepend://{body.txt} file://(-test-) resType://js
www.example.com/path3 jsPrepend://{body.txt} file://(-test-) resType://css
  • Requesting https://www.example.com/path1/to, the response content becomes
    html
    <!DOCTYPE html>
<script>Hello world.</script> -test-
  • Requesting https://www.example.com/path2/to, the response content becomes Hello world.-test-
  • Request https://www.example.com/path3/to. The response content becomes -test-.

Local/Remote Resources ​

txt
www.example.com/path1 jsPrepend:///User/xxx/test.js
www.example.com/path2 jsPrepend://https://www.xxx.com/xxx/params.js
# Editing a temporary file
www.example.com/path3 jsPrepend://temp/blank.js

Associated Protocols ​

  1. Inject content before the response content: reqPrepend
  2. Replace JavaScript response content: jsBody
  3. Inject content after JavaScript response content: jsPrepend