[GH-ISSUE #1907] [BUG] Scripting removes the = in the form body if the value is empty #1900

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opened 2026-03-03 19:55:16 +03:00 by kerem · 1 comment

kerem commented

2026-03-03 19:55:16 +03:00

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Originally created by @NghiaTranUIT on GitHub (Jan 14, 2024).
Original GitHub issue: https://github.com/ProxymanApp/Proxyman/issues/1907

Originally assigned to: @NghiaTranUIT on GitHub.

Description

If the value of a pair key and value is an empty string (application/x-www-form-urlencoded), Proxyman Scripting removes the =, which is the incorrect format.

Steps to Reproduce

Create a simple script for URL = https://httpbin.proxyman.app/post?action=bug

async function onRequest(context, url, request) {
  // console.log(request);
  console.log(url);

  // Update or Add new headers
  request.headers["X-New-Headers"] = "My-Value";

  // Done
  return request;
}

Make a request

curl 'https://httpbin.proxyman.app/post?action=bug' \
-X POST \
-H 'Host: httpbin.proxyman.app' \
-H 'Content-Type: application/x-www-form-urlencoded' \
--data-raw '__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=123' \
--proxy localhost:9090

Observe that the body of the request in the Main table view is modified incorrectly ❌

Current Behavior

The body is: (Missing some =)

__EVENTTARGET&__EVENTARGUMENT&__VIEWSTATE=123

Expected Behavior

The body is intact

__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=123

Originally created by @NghiaTranUIT on GitHub (Jan 14, 2024). Original GitHub issue: https://github.com/ProxymanApp/Proxyman/issues/1907 Originally assigned to: @NghiaTranUIT on GitHub. ## Description If the value of a pair key and value is an empty string (application/x-www-form-urlencoded), Proxyman Scripting removes the `=`, which is the incorrect format. ## Steps to Reproduce 1. Create a simple script for URL = `https://httpbin.proxyman.app/post?action=bug` ```js async function onRequest(context, url, request) { // console.log(request); console.log(url); // Update or Add new headers request.headers["X-New-Headers"] = "My-Value"; // Done return request; } ``` 2. Make a request ```sh curl 'https://httpbin.proxyman.app/post?action=bug' \ -X POST \ -H 'Host: httpbin.proxyman.app' \ -H 'Content-Type: application/x-www-form-urlencoded' \ --data-raw '__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=123' \ --proxy localhost:9090 ``` 3. Observe that the body of the request in the Main table view is modified incorrectly ❌ ## Current Behavior - The body is: (Missing some `=`) ``` __EVENTTARGET&__EVENTARGUMENT&__VIEWSTATE=123 ``` ## Expected Behavior - The body is intact ``` __EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=123 ```

kerem added the

bug

✅ Done

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2026-03-03 19:55:16 +03:00

kerem commented

2026-03-03 19:55:17 +03:00

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@NghiaTranUIT commented on GitHub (Jan 14, 2024):

Fixed: https://download.proxyman.io/beta/Proxyman_4.16.0_Fix_scripting_with_form_body.dmg

@NghiaTranUIT commented on GitHub (Jan 14, 2024): Fixed: https://download.proxyman.io/beta/Proxyman_4.16.0_Fix_scripting_with_form_body.dmg