fix(httpx_header): allow httpx determine the correct header

[giuliastf]

Fix: #508

Development Package

• Add this package as a dependency in your pyproject.toml:

[project]
dependencies = [
  # Exact version:
  "uipath==2.1.48.dev1005631078",

  # Any version from PR
  "uipath>=2.1.48.dev1005630000,<2.1.48.dev1005640000"
]

[[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
publish-url = "https://test.pypi.org/legacy/"
explicit = true

[tool.uv.sources]
uipath = { index = "testpypi" }

[Copilot]

Pull Request Overview

This PR fixes an httpx header issue by allowing httpx to determine the correct content-type header automatically instead of manually setting it. The change replaces manual string content serialization with proper JSON serialization using the json parameter.

• Removes hardcoded "Content-Type": "application/json" from default headers
• Converts manual string content creation to proper JSON serialization using json parameter
• Updates test assertions to use json.dumps() with consistent separators for comparison
• Adds proper params and json parameter handling to request calls

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/uipath/_services/_base_service.py	Removes hardcoded Content-Type header and adds RequestSpec handling methods
src/uipath/_services/processes_service.py	Converts manual content string to json parameter and adds proper request parameters
src/uipath/_services/assets_service.py	Converts content strings to json parameters and adds proper request handling
src/uipath/_services/actions_service.py	Removes manual JSON serialization in favor of json parameter and updates request calls
tests/sdk/services/test_base_service.py	Updates test expectations to remove Content-Type header assertion
tests/sdk/services/test_processes_service.py	Updates test assertions to use json.dumps() for consistent JSON comparison

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