[java] Remove deprecated GET /session/{sessionId}/se/files/{fileName} endpoint

[diemol]

🔗 Related Issues

Follow-up to #16844, which introduced this deprecation, and to the review discussion on #17968.

💥 What does this PR do?

Removes the deprecated GET /session/{sessionId}/se/files/{fileName} Grid Node endpoint and its client-side command (DriverCommand.GET_DOWNLOADED_FILE). #16844 (January 2026) marked it @Deprecated with a note to "Remove it in 4.41, 4.42 or 4.43." Trunk is now at 4.49.0-SNAPSHOT, six releases past that target.

What changed:

• Node.java — removed the route registration for GET /session/{sessionId}/se/files/{fileName}.
• LocalNode.java — removed the backward-compatibility dispatch branch and both extractFileName overloads that existed only to serve it.
• DriverCommand.java — removed the @Deprecated GET_DOWNLOADED_FILE constant.
• AbstractHttpCommandCodec.java — removed the corresponding command-codec entry and its now-unused import.
• LocalNodeTest.java — removed extractsFileNameFromRequestUri, which only tested the removed method.

The three endpoints every client binding actually uses — GET /session/{sessionId}/se/files (list), POST /session/{sessionId}/se/files (download via JSON body), and DELETE /session/{sessionId}/se/files (delete) — are untouched.

🔧 Implementation Notes

Checked all four bindings (Python, Ruby, JavaScript, .NET): none of them ever built a request to the path-parameter GET form, they only use the three endpoints above (GET_DOWNLOADED_FILE was Java-only, unused since 4.40 per its own javadoc). So this removal has no cross-binding impact.

Verified with bazel test that NodeTest, LocalNodeTest, W3CHttpCommandCodecTest, and JdkHttpClientTest all still pass after the removal, and ran ./scripts/format.sh --pre-commit clean.

🤖 AI assistance

• No substantial AI assistance used
• AI assisted (complete below)
  • Tool(s): Claude Code (Claude Sonnet 5)
  • What was generated: an inventory of every reference to the deprecated endpoint across the repo (Java call sites, tests, docs, all four language bindings), and the resulting removal diff across the 5 files listed above.
  • I reviewed all AI output and can explain the change

💡 Additional Considerations

None — this removes dead, already-deprecated code with an existing replacement (DOWNLOAD_FILE / POST) that all bindings already use.

🔄 Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)

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Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (1) 📜 Skill insights (0)

1. Removed route lacks regression test 📘 Rule violation ☼ Reliability

Description

The deprecated file-download route is removed without a test asserting that `GET
/session/{sessionId}/se/files/{fileName}` is rejected while the supported collection routes remain
available. This leaves the intended endpoint contract insufficiently protected against accidental
restoration or routing regressions.

Code

java/src/org/openqa/selenium/grid/node/Node.java[L174-176]

-            get("/session/{sessionId}/se/files/{fileName}")
-                .to(params -> new DownloadFile(this, sessionIdFrom(params)))
-                .with(spanDecorator("node.download_file")),

Evidence

PR Compliance ID 5 requires changed behavior to have appropriately scoped tests. The route is
removed in Node.java, while the PR deletes the helper-only filename extraction test and adds no
test asserting the removed route is unavailable.

AGENTS.md: Prefer Small Reliable Tests and Avoid Contract-Misrepresenting Mocks
java/src/org/openqa/selenium/grid/node/Node.java[171-176]
java/test/org/openqa/selenium/grid/node/NodeTest.java[808-908]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
The removed `GET /session/{sessionId}/se/files/{fileName}` route has no replacement regression test verifying that requests to it are rejected.

## Issue Context
The existing download tests cover the supported list, POST download, and DELETE operations, but the behavior introduced by this PR—the removal of the path-parameter GET route—should also be covered by a small routing test.

## Fix Focus Areas
- java/test/org/openqa/selenium/grid/node/NodeTest.java[808-908]

ⓘ Copy this prompt and use it to remediate the issue with your preferred AI generation tools

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Context sources

Review mode: ⚖️ Balanced: This is a localized but behavior-changing removal of a public Grid endpoint and client command, creating compatibility and routing risk that warrants a complete single-pass review.

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