Introduce a 10s connect timeout by konstin · Pull Request #17733 · astral-sh/uv

konstin · 2026-01-29T13:05:51Z

See #17697 for discussion.

Introduce a 10s connect timeout, configurable with UV_HTTP_CONNECT_TIMEOUT. The existing HTTP timeout gets the more precise description as HTTP read timeout.

EliteTK

Looks good. But why not UV_CONNECT_HTTP_TIMEOUT for consistency with the upload one?

zanieb · 2026-01-29T14:53:31Z

UV_UPLOAD_HTTP_TIMEOUT is an HTTP timeout scoped to the uploads in the publish command. I think this naming is proper.

zanieb · 2026-01-29T14:54:37Z

Though maybe it should be UV_PUBLISH_HTTP_TIMEOUT or something instead? I'm not sure.

konstin · 2026-01-29T14:56:17Z

I have no opinion on the order of words :) I can update in either direction.

EliteTK · 2026-01-29T15:17:27Z

UV_UPLOAD_HTTP_TIMEOUT is an HTTP timeout scoped to the uploads in the publish command. I think this naming is proper.

Okay, that makes sense.

Then I think the code shouldn't rename upload_http_timeout to http_upload_timeout.

zanieb · 2026-01-29T17:54:57Z

crates/uv-settings/src/lib.rs

-    pub http_timeout: Duration,
+    pub http_read_timeout: Duration,
+    pub http_connect_timeout: Duration,
+    pub http_upload_timeout: Duration,


This seems confusing to rename. This is the http read timeout for uv publish file uploads. We should probably call it http_read_timeout_upload or something?

zanieb · 2026-01-29T17:56:44Z

crates/uv-distribution/src/distribution_database.rs

    /// Handle a specific `reqwest` error, and convert it to [`io::Error`].
    fn handle_response_errors(&self, err: reqwest::Error) -> io::Error {
        if err.is_timeout() {
+            // Assumption: The connect timeout with the 10s default is not the culprit.


Can we validate this assumption based on the duration of the actual timeout that occurred or the type of the error?

(Or, why do you think this assumption is fine?)

The assumption is that if you're experiencing a network failure, the (default) UV_CONNECT_TIMEOUT is not the culprit and we don't want to guide users towards it. I'm assuming that if you can't connect to a server in 10s and 3 retries, your problem isn't solved by increasing the timeout.

FWIW I'm not sure about whether anyone actually needs to bump UV_HTTP_TIMEOUT either (i'm not aware of cases where nothing happened for 30s but it recovered after that), now that it's a read timeout instead of a request timeout (trying to confirm with the one major user: apache/airflow#61205). This error should be hardly reachable now, and most likely indicates that either the server is down, or you're on a network so unreliable that the connection broke 4 times in ways that reqwest/hyper couldn't recover from.

If the DNS is down or something won't we then recommend increasing the read timeout erroneously though?

now that it's a read timeout instead of a request timeout

When did this change again?

This error should be hardly reachable now, and most likely indicates that either the server is down, or you're on a network so unreliable that the connection broke 4 times in ways that reqwest/hyper couldn't recover from.

This seems contrary to the claim that users won't hit the connect timeout here :D

That was imprecise, all the basic cases we handle properly.

If you hit this timeout something is down in a weird way, think a server starting to respond but then pulling from an upstream that never responds. Testing this I also found deactivating and reactivating network in under the timeout on my linux machine causes a timeout with 3 retries, which sounds like a bug in reqwest? (but doesn't rely on the timeout)

Reproducing the timeout requires a response far enough that uv doesn't reject it immediately, but then still hangs without sending more data.

The examples below for how we handle the basic failure cases use #17735 (stacked on top of this).

Using the wrong URL:

time uv pip install tqdm --index-url https://thisdoesnotexist.nope ⠦ Resolving dependencies... error: Request failed after 3 retries Caused by: Failed to fetch: `https://thisdoesnotexist.nope/tqdm/` Caused by: error sending request for url (https://thisdoesnotexist.nope/tqdm/) Caused by: client error (Connect) Caused by: dns error Caused by: failed to lookup address information: Name or service not known real 0m2,932s user 0m0,043s sys 0m0,032s

A server that is down (index):

$ time uv-debug pip install tqdm --index-url https://example.com:81 ⠧ Resolving dependencies... error: Request failed after 3 retries Caused by: Failed to fetch: `https://example.com:81/tqdm/` Caused by: error sending request for url (https://example.com:81/tqdm/) Caused by: client error (Connect) Caused by: operation timed out real 0m46,469s user 0m0,084s sys 0m0,040s

A server that is down (streaming):

$ time uv-debug pip install https://example.com:81/tqdm-0.1-py3-none-any.whl × Failed to download `tqdm @ https://example.com:81/tqdm-0.1-py3-none-any.whl` ├─▶ Request failed after 3 retries ├─▶ Failed to fetch: `https://example.com:81/tqdm-0.1-py3-none-any.whl` ├─▶ error sending request for url (https://example.com:81/tqdm-0.1-py3-none-any.whl) ├─▶ client error (Connect) ╰─▶ operation timed out real 0m44,384s user 0m0,085s sys 0m0,048s

For the basic cases, the branch and 0.9.28 show the same messages

Reported upstream: seanmonstar/reqwest#2956

These messages were added before we switched from a per-request to a per-read timeout (#1961, #3144), and we don't have a test case (non of the network tests trigger this path), can we remove them? CC @samypr100

fwiw, I don't consider any of these a blocker for this PR, which works independently of them.

EliteTK · 2026-02-03T11:53:28Z

With the changes applied, it seems like this was always the case, but UV_UPLOAD_HTTP_TIMEOUT was always just a read timeout? Not quite relevant here but wouldn't we want to be setting some kind of write timeout for uploads instead of a read timeout?

Most of the data in the upload case will be in the direction of the server.

konstin · 2026-02-03T19:47:54Z

With the changes applied, it seems like this was always the case, but UV_UPLOAD_HTTP_TIMEOUT was always just a read timeout? Not quite relevant here but wouldn't we want to be setting some kind of write timeout for uploads instead of a read timeout?

We do, but reqwest doesn't support write timeouts, that's why we use the 15min read timeout.

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ARM64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-aarch64-unknown-linux-musl.tar.gz.sha256) | | [uv-i686-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-i686-unknown-linux-musl.tar.gz.sha256) | | [uv-x86\_64-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-x86_64-unknown-linux-musl.tar.gz.sha256) | | [uv-arm-unknown-linux-musleabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-arm-unknown-linux-musleabihf.tar.gz.sha256) | | [uv-armv7-unknown-linux-musleabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.30/uv-armv7-unknown-linux-musleabihf.tar.gz.sha256) | #### Verifying GitHub Artifact Attestations The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the [GitHub CLI](https://cli.github.com/manual/gh_attestation_verify): ```sh gh attestation verify <file-path of downloaded artifact> --repo astral-sh/uv ``` You can also download the attestation from [GitHub](https://github.com/astral-sh/uv/attestations) and verify against that directly: ```sh gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation> ``` ### [`v0.9.29`](https://github.com/astral-sh/uv/releases/tag/0.9.29) [Compare Source](astral-sh/uv@0.9.28...0.9.29) #### Release Notes Released on 2026-02-03. ##### Python - Update to Pyodide 0.29.3 ([#17730](astral-sh/uv#17730)) ##### Enhancements - Add wheel-tag-style aliases for manylinux platform names ([#17750](astral-sh/uv#17750)) - Hint on `uv version --bump dev` similar to pre-release bumps ([#17796](astral-sh/uv#17796)) - Improve display of RFC 9457 Problem Detail responses in `uv publish` server errors ([#17787](astral-sh/uv#17787)) - Improve the wording of publish errors during dry-run ([#17782](astral-sh/uv#17782)) - Set backoff to 10 retries ([#17816](astral-sh/uv#17816)) - Add properties to synthentic and project roots in Cyclone DX exports ([#17820](astral-sh/uv#17820)) - Identify the invidividual clients in `uv publish` trace logs ([#17784](astral-sh/uv#17784)) ##### Preview features - Remove special casing for `base` and `default` conda environment names ([#17758](astral-sh/uv#17758)) ##### Bug fixes - Fix `PYTHONHOME` inheritance when spawning different Python versions ([#17821](astral-sh/uv#17821)) - Fix wheel rejections on freethreading+debug builds ([#17812](astral-sh/uv#17812)) - Pad with zeros during comparisons in `EqualStar` and `NotEqualStar` operators ([#17751](astral-sh/uv#17751)) - Reject unknown field names in conflict declarations ([#17727](astral-sh/uv#17727)) - Fix panics in `system-configuration` in sandboxes ([#17829](astral-sh/uv#17829)) ##### Documentation - Update pip pre-release compatibility information ([#17788](astral-sh/uv#17788)) ##### Security - Hide a subset of environment variable values in `--help` ([#17745](astral-sh/uv#17745)) #### Install uv 0.9.29 ##### Install prebuilt binaries via shell script ```sh curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.29/uv-installer.sh | sh ``` ##### Install prebuilt binaries via powershell script ```sh powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/uv/releases/download/0.9.29/uv-installer.ps1 | iex" ``` #### Download uv 0.9.29 | File | Platform | Checksum | | --------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------- | -------------------------------------------------------------------------------------------------------------------- | | [uv-aarch64-apple-darwin.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-apple-darwin.tar.gz.sha256) | | [uv-x86\_64-apple-darwin.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-apple-darwin.tar.gz.sha256) | | [uv-aarch64-pc-windows-msvc.zip](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-pc-windows-msvc.zip.sha256) | | [uv-i686-pc-windows-msvc.zip](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-pc-windows-msvc.zip.sha256) | | [uv-x86\_64-pc-windows-msvc.zip](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-pc-windows-msvc.zip.sha256) | | [uv-aarch64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-unknown-linux-gnu.tar.gz.sha256) | | [uv-i686-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-unknown-linux-gnu.tar.gz.sha256) | | [uv-powerpc64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-powerpc64-unknown-linux-gnu.tar.gz) | PPC64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-powerpc64-unknown-linux-gnu.tar.gz.sha256) | | [uv-powerpc64le-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-powerpc64le-unknown-linux-gnu.tar.gz) | PPC64LE Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-powerpc64le-unknown-linux-gnu.tar.gz.sha256) | | [uv-riscv64gc-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-riscv64gc-unknown-linux-gnu.tar.gz.sha256) | | [uv-s390x-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-s390x-unknown-linux-gnu.tar.gz.sha256) | | [uv-x86\_64-unknown-linux-gnu.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-unknown-linux-gnu.tar.gz) | x64 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-unknown-linux-gnu.tar.gz.sha256) | | [uv-armv7-unknown-linux-gnueabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-armv7-unknown-linux-gnueabihf.tar.gz) | ARMv7 Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-armv7-unknown-linux-gnueabihf.tar.gz.sha256) | | [uv-aarch64-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-unknown-linux-musl.tar.gz) | ARM64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-aarch64-unknown-linux-musl.tar.gz.sha256) | | [uv-i686-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-i686-unknown-linux-musl.tar.gz.sha256) | | [uv-x86\_64-unknown-linux-musl.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-x86_64-unknown-linux-musl.tar.gz.sha256) | | [uv-arm-unknown-linux-musleabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-arm-unknown-linux-musleabihf.tar.gz.sha256) | | [uv-armv7-unknown-linux-musleabihf.tar.gz](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://github.com/astral-sh/uv/releases/download/0.9.29/uv-armv7-unknown-linux-musleabihf.tar.gz.sha256) | #### Verifying GitHub Artifact Attestations The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the [GitHub CLI](https://cli.github.com/manual/gh_attestation_verify): ```sh gh attestation verify <file-path of downloaded artifact> --repo astral-sh/uv ``` You can also download the attestation from [GitHub](https://github.com/astral-sh/uv/attestations) and verify against that directly: ```sh gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation> ``` </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

konstin requested review from EliteTK and zanieb January 29, 2026 13:05

konstin added enhancement New feature or improvement to existing functionality network Network connectivity e.g. proxies, DNS, and SSL labels Jan 29, 2026

EliteTK approved these changes Jan 29, 2026

View reviewed changes

zanieb reviewed Jan 29, 2026

View reviewed changes

konstin temporarily deployed to uv-test-publish January 30, 2026 13:58 — with GitHub Actions Inactive

konstin force-pushed the konsti/connect-timeout-and-retry branch from ecb43c2 to 2ba2382 Compare February 2, 2026 12:17

konstin closed this Feb 3, 2026

konstin force-pushed the konsti/connect-timeout-and-retry branch from 2ba2382 to 1f1321d Compare February 3, 2026 20:07

konstin reopened this Feb 3, 2026

konstin temporarily deployed to uv-test-publish February 3, 2026 20:13 — with GitHub Actions Inactive

konstin force-pushed the konsti/connect-timeout-and-retry branch 2 times, most recently from c83593b to 31e94f6 Compare February 4, 2026 16:20

konstin temporarily deployed to uv-test-publish February 4, 2026 16:24 — with GitHub Actions Inactive

zanieb had a problem deploying to uv-test-publish February 4, 2026 19:07 — with GitHub Actions Failure

Introduce a 10s connect timeout

d3a0d08

konstin force-pushed the konsti/connect-timeout-and-retry branch from d19338a to d3a0d08 Compare February 5, 2026 10:27

Consistent naming for DEFAULT_READ_TIMEOUT_UPLOAD

f0ccf90

konstin temporarily deployed to uv-test-publish February 5, 2026 10:35 — with GitHub Actions Inactive

konstin merged commit bd8503a into main Feb 5, 2026
53 checks passed

konstin deleted the konsti/connect-timeout-and-retry branch February 5, 2026 13:24

BrewTestBot mentioned this pull request Feb 5, 2026

uv 0.10.0 Homebrew/homebrew-core#266096

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zanieb commented Jan 29, 2026 •

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konstin Jan 30, 2026 •

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