DOC-372: Document AWS_CA_BUNDLE fix for python TEI in DNS mode - #901
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quetzalliwrites wants to merge 1 commit into
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DOC-372: Document AWS_CA_BUNDLE fix for python TEI in DNS mode#901quetzalliwrites wants to merge 1 commit into
quetzalliwrites wants to merge 1 commit into
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Note that python Lambdas bundling botocore >= 1.43.54 now work by default under Transparent Endpoint Injection, since LocalStack only sets an empty AWS_CA_BUNDLE in DNS-based injection mode (LAMBDA_DISABLE_AWS_ENDPOINT_URL=1) rather than unconditionally. Document the DISABLE_TRANSPARENT_ENDPOINT_INJECTION=1 workaround for users who need DNS mode with a bundled current botocore.
quetzalliwrites
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August 28, 2026 14:30
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Summary
Documents the fix from localstack-pro#8065: LocalStack now only sets an empty
AWS_CA_BUNDLEfor python Lambda Transparent Endpoint Injection when DNS-based injection (LAMBDA_DISABLE_AWS_ENDPOINT_URL=1) is active, rather than unconditionally. This unblocks python Lambdas that bundle botocore >= 1.43.54, which added validation rejecting an emptyAWS_CA_BUNDLEwithInvalidConfigError.Added a note to the "Self-signed certificates" section of the Transparent Endpoint Injection doc explaining:
AWS_ENDPOINT_URLactive) mode now works out of the box with a bundled current botocore, since it reaches LocalStack over plain HTTP and needs no cert handling.AWS_CA_BUNDLE, which is incompatible with a bundled current botocore — useDISABLE_TRANSPARENT_ENDPOINT_INJECTION=1as the workaround in that case.Linear ticket
https://linear.app/localstack/issue/DOC-372/doc-fixlambda-only-set-empty-aws-ca-bundle-for-python-tei-in-dns-mode
Test plan
npx astro buildcompletes successfully (404 pages built)