CI experiment: test PR 1261 with Reseau Windows IOCP branch

[quinnj]

Summary

• starts from PR feat(websockets): add isready(ws) to poll for buffered messages #1261 head and pins Windows CI to fix(iopoll): use overlapped TCP IO on Windows JuliaServices/Reseau.jl#111 at d5350e1
• keeps the WebSocket isready tests intact; they pass before the transport-heavy suites
• includes two HTTP-side hardening/test changes discovered during validation:
  • defer request-upload write aborts after the request head has been sent so early final responses can still be read
  • make raw redirect parity test servers drain request bodies and gracefully finish response writes before close on Windows

Findings

The old Windows hangs on #1261 were not caused by the WebSocket isready change. The failing stacks were blocked under Reseau waitread while HTTP was reading response status lines. Pinning the Reseau overlapped IOCP branch cleared the previous HTTP/1 server/client failures.

The only remaining HTTP failure after the Reseau fix was in our added raw parity redirect test. With temporary Reseau IOCP tracing enabled during investigation it showed Windows WSAECONNRESET (raw_error = 10054) when the test server wrote a response and immediately closed; finishing the write side before close made the test about redirect semantics instead of RST timing. The Reseau PR no longer keeps that temporary tracing code.

After trimming the Reseau diagnostics, Reseau CI run 26716840261 passed on head d5350e16e770515c58cc21f317424584c2336e35. HTTP run 26716908457 got past the corrected Reseau pin and passed Windows pre, Ubuntu 1/pre, macOS, and docs. The only Actions job failure was Windows Julia 1 in HTTP/2 server handles concurrent streams on one connection at test/http2_server_tests.jl:862 because elapsed < 1.75 observed 1.8410000801086426. That is a tight HTTP/2 timing assertion, not the old Windows waitread hang.

Verification

• julia --project=. --startup-file=no --history-file=no -e 'include("test/http_client_tests.jl")'
• julia --project=. --startup-file=no --history-file=no -e 'include("test/http_server_http1_tests.jl")'
• julia --project=. --startup-file=no --history-file=no -e 'include("test/http_parity_tests.jl")'
• git diff --check
• Earlier HTTP GitHub Actions run 26703203916 passed all Actions jobs, including both Windows lanes, against the pre-trim Reseau head
• Current trimmed-head validation run 26716908457 passed every Actions job except Windows Julia 1, which hit the HTTP/2 timing assertion above
• External Codecov patch/project checks may still fail on this draft experiment PR

Related

• feat(websockets): add isready(ws) to poll for buffered messages #1261
• fix(iopoll): use overlapped TCP IO on Windows JuliaServices/Reseau.jl#111
• Intermittent Windows hang: re-armed read deadline + parked readavailable strands (IOCP) JuliaServices/Reseau.jl#107

Co-authored by Codex

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.32%. Comparing base (f9d62af) to head (ec759e5).

Files with missing lines	Patch %	Lines
src/http_transport.jl	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1263      +/-   ##
==========================================
- Coverage   84.36%   84.32%   -0.04%     
==========================================
  Files          28       28              
  Lines       10689    10695       +6     
==========================================
+ Hits         9018     9019       +1     
- Misses       1671     1676       +5     

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