chore: release 0.49.2 — retry SERVICE_UNAVAILABLE (bounded) (#688)

* chore: retry StatusCode::SERVICE_UNAVAILABLE

* changelog

* chore: nudge PR sync

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs: clarify SERVICE_UNAVAILABLE retry in changelog

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* .

* fix: bound SERVICE_UNAVAILABLE retries like TOO_MANY_REQUESTS

The 503 retry branch looped forever (no cap, no deadline), unlike the
429 branch which gives up after 6 retries. A persistent 503 hung the
caller indefinitely. This also broke the wasm browser test job, whose
mock service worker uses 503 as its "handler threw" sentinel.

Merge the two branches so 503 shares the same 6-retry cap as 429.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* chore: release 0.49.2 — retry SERVICE_UNAVAILABLE (bounded)

Bump all workspace crates 0.49.1 -> 0.49.2. Patch release: the HTTP
retry logic now also retries 503 SERVICE_UNAVAILABLE, sharing the same
6-retry bound as 429 TOO_MANY_REQUESTS.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Linwei Shang <linwei.shang@dfinity.org>

Author: 3 people

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## [0.49.2] - 2026-07-23
+
+* `ic-agent`: The HTTP retry logic now also retries requests that fail with `StatusCode::SERVICE_UNAVAILABLE` (503), in addition to `TOO_MANY_REQUESTS` (429). This prevents non-idempotent calls from spuriously failing while polling for their status against a replica that is temporarily unhealthy (e.g. has no recent certified state, or a full ingress pool). Both status codes share the same retry bound (up to 6 retries).
+
 ## [0.49.1] - 2026-07-20
 
 * `ic-agent`: Replaced the unmaintained `backoff` dependency with `backon` for the `request_status` polling backoff, using `backon`'s `ExponentialBackoff` iterator directly. The schedule is unchanged (500ms initial delay, growing by 1.4x up to 1s, jittered). `max_polling_time` now bounds the cumulative backoff sleep (via `backon`'s `with_total_delay`) rather than wall-clock elapsed time; in practice they differ only by per-poll request latency.

Cargo.lock

@@ -13,7 +13,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.49.1"
+version = "0.49.2"
 authors = ["DFINITY Stiftung <sdk@dfinity.org>"]
 edition = "2021"
 repository = "https://github.com/dfinity/agent-rs"
@@ -30,10 +30,10 @@ license = "Apache-2.0"
 #   a comment listing those crates). Otherwise, features are declared in the individual crate Cargo.toml.
 #
 # The path dependencies below ensure all workspace members use the same version of internal crates.
-ic-agent = { path = "ic-agent", version = "0.49.1", default-features = false }
-ic-identity-hsm = { path = "ic-identity-hsm", version = "0.49.1" }
-ic-transport-types = { path = "ic-transport-types", version = "0.49.1" }
-ic-utils = { path = "ic-utils", version = "0.49.1" }
+ic-agent = { path = "ic-agent", version = "0.49.2", default-features = false }
+ic-identity-hsm = { path = "ic-identity-hsm", version = "0.49.2" }
+ic-transport-types = { path = "ic-transport-types", version = "0.49.2" }
+ic-utils = { path = "ic-utils", version = "0.49.2" }
 ic-utils-bindgen = { path = "ic-utils-bindgen" }
 ref-tests = { path = "ref-tests" }
 

Cargo.toml

@@ -220,7 +220,7 @@ impl Agent {
     /// Create an instance of an [`Agent`].
     pub fn new(config: agent_config::AgentConfig) -> Result<Agent, AgentError> {
         let client = config.http_service.unwrap_or_else(|| {
-            Arc::new(Retry429Logic {
+            Arc::new(RetryLogic {
                 client: config.client.unwrap_or_else(|| {
                     #[cfg(not(target_family = "wasm"))]
                     {
@@ -2406,13 +2406,13 @@ where
 }
 
 #[derive(Debug)]
-struct Retry429Logic {
+struct RetryLogic {
     client: Client,
 }
 
 #[cfg_attr(target_family = "wasm", async_trait(?Send))]
 #[cfg_attr(not(target_family = "wasm"), async_trait)]
-impl HttpService for Retry429Logic {
+impl HttpService for RetryLogic {
     async fn call<'a>(
         &'a self,
         req: &'a (dyn Fn() -> Result<http::Request<Bytes>, AgentError> + Send + Sync),
@@ -2436,7 +2436,9 @@ impl HttpService for Retry429Logic {
                 to_http_response(resp, _size_limit).await?
             };
 
-            if resp.status() == StatusCode::TOO_MANY_REQUESTS {
+            if resp.status() == StatusCode::TOO_MANY_REQUESTS
+                || resp.status() == StatusCode::SERVICE_UNAVAILABLE
+            {
                 if retries == 6 {
                     break Ok(resp);
                 } else {