Add HTTPX2Wrapper MVP as a standalone wrapper step

[mwdd146980]

What does this PR do?

Reintroduces the HTTPX2Wrapper MVP — an httpx2-backed HTTP client behind the use_httpx flag — as its own step stacked on the httpx migration feature branch. It re-applies exactly what was reverted from the base in #24306 (revert-the-revert), so the diff is identical to the originally reviewed #23883.

Motivation

Per team decision, the wrapper ships as a separate step after the agnostic-protocol test migration lands, rather than living in the feature-branch base. Isolating it as its own PR lets the parity work (proxy #24023, auth-token) stack on the wrapper independently of the test-migration branches.

Verification

Re-applied by reverting the base revert commit, so the diff is byte-identical to the reviewed #23883. Confirmed at 19 files and 1686 insertions, the exact inverse of revert #24306. The wrapper is gated behind the use_httpx flag and defaults off, so no runtime behavior changes for existing checks. The wrapper's own httpx2 test suite ships with it and was green under #23883.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required. (qa/skip-qa: flag-gated behind use_httpx, default off; content identical to the already-reviewed Add HTTPX2Wrapper MVP #23883.)
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[datadog-official]

 

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⚠️ Warnings

🚦 3 Pipeline jobs failed

PR All | test / jb232c8c / Datadog Checks Base on Linux     

PR All Windows | test / jda96080 / Datadog Checks Base on Windows     

Validate repository | Run Validations / Validate     

🧪 2 Tests failed in 2 jobs

PR All | run  

test_response_adapter_satisfies_protocol from test_response.py  

assert False
 +  where False = isinstance(<datadog_checks.base.utils.httpx2.HTTPX2ResponseAdapter object at 0x7f351a92fd60>, HTTPResponseProtocol)

PR All Windows | run  

test_response_adapter_satisfies_protocol from test_response.py  

assert False
 +  where False = isinstance(<datadog_checks.base.utils.httpx2.HTTPX2ResponseAdapter object at 0x0000024004675210>, HTTPResponseProtocol)

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

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[dd-octo-sts]

Validation Report

Validation	Description	Status
dep	Verify dependency pins are consistent and Agent-compatible	❌

Run ddev validate all changed --fix to attempt to auto-fix supported validations.

Passed validations (20)

Validation	Description	Status
agent-reqs	Verify check versions match the Agent requirements file	✅
ci	Validate CI configuration and code coverage settings	✅
codeowners	Validate every integration has a CODEOWNERS entry	✅
config	Validate default configuration files against spec.yaml	✅
http	Validate integrations use the HTTP wrapper correctly	✅
imports	Validate check imports do not use deprecated modules	✅
integration-style	Validate check code style conventions	✅
jmx-metrics	Validate JMX metrics definition files and config	✅
labeler	Validate PR labeler config matches integration directories	✅
legacy-signature	Validate no integration uses the legacy Agent check signature	✅
license-headers	Validate Python files have proper license headers	✅
licenses	Validate third-party license attribution list	✅
metadata	Validate metadata.csv metric definitions	✅
models	Validate configuration data models match spec.yaml	✅
openmetrics	Validate OpenMetrics integrations disable the metric limit	✅
package	Validate Python package metadata and naming	✅
qa-label	Validate the pull request declares whether it needs QA for the next Agent release	✅
readmes	Validate README files have required sections	✅
saved-views	Validate saved view JSON file structure and fields	✅
version	Validate version consistency between package and changelog	✅

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