New HTTP Request activity (UiPath.WebAPI.Activities 2.3.0) Argument 'Result': BC30311: Value of type 'HttpResponseSummary' cannot be converted to 'String'. The selected value is incompatible with the property type

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1

When using HTTP Request (NetHttpRequest) from WebAPI 2.3.0, the Response content output cannot be assigned to a String variable. Studio coerces/binds it to HttpResponseSummary, causing compile/runtime errors and preventing us from reading the response body. Downgrading the package to 1.15.0 restores the expected behavior (Response content → String).

Product / Versions

  • Studio: 2025.0.167 STS Enterprise Licencse
  • UiPath.WebAPI.Activities: 2.3.0 (problem)
    (works as expected on 1.15.0)
  • Windows / Target framework: (Windows / Windows-Legacy, .NET 6/4.6.1, etc.)

Steps to Reproduce (minimal)

  1. Create a new process.
  2. Add HTTP Request (WebAPI 2.3.0).
  3. Method: GET, URL: https://httpbin.org/get (or any echo endpoint).
  4. Create variable respBody As String.
  5. In Output → Response content, select respBody.
  6. Add Message Box with respBody.

Actual:

  • Designer shows type mismatch / auto-casts output to a HttpResponseSummary variable, or compilation error similar to:
    Argument 'Response content': Value of type 'HttpResponseSummary' cannot be converted to 'String'.
  • Message Box cannot accept the variable without extra parsing.

Expected:

  • Response content binds to a String variable (the raw body), same as WebAPI 1.15.0 and as documented
2

Change the Data Type in the UiPath Studio project → Data Manager → Variables of the respBody variable from System.String to UiPath.Web.Activities.Http.Models.HttpResponseSummary

Results for Message Box activity with message respBody.TextContent after applying the above:

image
image396×280 5.76 KB

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3

Just to complete the answer above:

  • the HTTP Request (legacy) activity returned multiple outputs, the Response content being one of them and of the type String
  • in the new HTTP Request, we opted for a simplified output variable structure, where the single output variable has multiple properties, the .TextContent being one of them:
    image
    image350×459 17.8 KB
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4

Thanks — I really appreciate your help, but I managed to find the solution myself. I converted the output to a string, and it’s working fine now. Here’s what I did:

  • Used the ‘Assign’ activity
    • saveTo → created a new variable
    • valueToSave → vResult.TextContent (where vResult is the output of the HTTP request activity, returned as httpsResponseSummary) :slight_smile: