feat(python-sdk): move template build-context uploads onto pyqwest

[mishushakov]

What

Stacked on #1602 (which is stacked on #1601). Migrates the template build-context uploads (streaming the build archive to S3 presigned URLs in build_api.upload_file) onto pyqwest via its httpx-compatible transport adapter.

Originally deferred from #1601 because S3 presigned URLs reject chunked transfer encoding and Content-Length framing through reqwest was unverified. Verified at the wire level (raw-socket capture server): httpx's Content-Length — derived from the spooled archive (sync) or set explicitly on the async-iterator body (async) — is forwarded by the adapter and reqwest keeps Content-Length framing for streamed bodies, no chunked fallback.

Note

Rebased onto #1601, which maps httpx.Proxy onto pyqwest's Proxy object and therefore requires pyqwest 0.8 (released, and locked in #1601). The only change here is following the rename — this PR builds its transport from proxy_to_config(...) instead of proxy_to_url(...).

How

• e2b/template_sync/build_api.py / template_async/build_api.py: upload_file uses a one-off pyqwest transport (ApiPyqwestTransport from feat(python-sdk): move the REST API client onto pyqwest's httpx transport adapter #1601) instead of the generated client's httpx transport.
• verify_ssl=False on the generated client is no longer honored for uploads (pyqwest has no insecure-TLS option), and http2=False is gone (S3 negotiates HTTP/1.1 via ALPN anyway).
• The 1-hour upload timeout now bounds the entire upload rather than each socket write — arguably the intended meaning for that endpoint.

Testing

• tests/{sync,async}/*/test_upload_file.py (the [JS SDK] uploadFile uses chunked transfer encoding, causing 501 NotImplemented on S3 presigned PUT URLs #1243 regression tests — Content-Length present and equal to the body, no chunked encoding) pass through pyqwest; the capture handlers now compare header names case-insensitively since hyper lowercases them where httpcore title-cased.
• Lint (ruff), typecheck (ty), unit suite: green.

Usage example

No API changes — template builds upload their context exactly as before:

from e2b import Template

template = Template().from_image("ubuntu:22.04").copy("data/", "/data")
Template.build(template, alias="my-template")   # archive upload now goes through pyqwest

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: ccab1da

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@e2b/python-sdk	Minor

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[cursor]

PR Summary

Medium Risk
Changes the HTTP stack and timeout/TLS behavior for large template build uploads to S3; scoped and regression-tested, but mis-timed uploads or dev environments relying on verify_ssl=False could break.

Overview
Template build-context archive uploads to S3 presigned URLs now use pyqwest (reqwest) through the existing ApiPyqwestTransport / AsyncApiPyqwestTransport adapters instead of httpx’s default transport, in both sync and async upload_file paths.

The one-off upload client still streams the tar with an explicit Content-Length so S3 does not see chunked encoding; proxy settings are mapped via proxy_to_config. verify_ssl=False on the API client is no longer applied to these uploads (pyqwest has no insecure-TLS switch), and the 1-hour upload timeout applies to the whole transfer, not per socket write. Upload regression tests now assert headers case-insensitively because pyqwest/hyper lowercases header names.

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[github-actions]

Package Artifacts

Built from 7190dd6. Download artifacts from this workflow run.

JS SDK (e2b@2.36.2-migrate-template-uploads-to-pyqwest.0):

npm install ./e2b-2.36.2-migrate-template-uploads-to-pyqwest.0.tgz

CLI (@e2b/cli@2.16.1-migrate-template-uploads-to-pyqwest.0):

npm install ./e2b-cli-2.16.1-migrate-template-uploads-to-pyqwest.0.tgz

Python SDK (e2b==2.35.0+migrate.template.uploads.to.pyqwest):

pip install ./e2b-2.35.0+migrate.template.uploads.to.pyqwest-py3-none-any.whl

[linear-code]

SDK-268