Module http 

The shared HTTP transport layer (hoisted from anthropic/ at Task 18): retry policy + backoff, the HttpFailure carrier, Retry-After parsing, client construction, and schema normalization. Per-wire error classification stays wire-local (body shapes and terminal heuristics genuinely differ).

Structs

HttpFailure

A classified HTTP failure plus the retry-control signals that ride beside the error taxonomy (x-should-retry override — Anthropic-only, other wires always pass false — and Retry-After).

RetryPolicy

Transport-retry knobs (Task-12 plan §3.6; sources: Claude Code 500ms·2ⁿ cap 32s, grok’s 429-cap-2 and 120s Retry-After cap, codex’s ±10% jitter).

Functions

backoff

Compute the pre-retry sleep for attempt (1-based). Retry-After takes precedence and bypasses the exponential cap (itself capped); otherwise exponential with ±10% jitter.

build_http_client

Build the reqwest client with the wires’ shared timeouts (30s connect, 10min total — non-streaming reasoning turns can run minutes).

normalize_input_schema

Normalize a schemars-derived schema into the input_schema/parameters the APIs accept: our flat Args structs emit no $defs/$ref (generation inlines subschemas at the source), so normalization reduces to stripping the top-level $schema meta-annotation. Shared by every wire.

parse_retry_after

Parse a Retry-After header value: integer delta-seconds only. HTTP-date forms → None (fall back to exp backoff) — grok’s simplification.

run_with_retry

Drive op until success, a terminal classification, or attempt exhaustion. Generic over the success type — the loop only inspects HttpFailure.