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The following functions can be loaded from @bazel_tools//tools/build_defs/repo:cache.bzl. Returns the default canonical id to use for downloads.

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get_default_canonical_id

load("@bazel//tools/build_defs/repo:cache.bzl", "get_default_canonical_id")

get_default_canonical_id(<a href="#get_default_canonical_id-repository_ctx">repository_ctx</a>, <a href="#get_default_canonical_id-urls">urls</a>)
Returns the default canonical id to use for downloads. Returns "" (empty string) when Bazel is run with --repo_env=BAZEL_HTTP_RULES_URLS_AS_DEFAULT_CANONICAL_ID=0. e.g. 
load("@bazel_tools//tools/build_defs/repo:cache.bzl", "get_default_canonical_id")
# ...
    repository_ctx.download_and_extract(
        url = urls,
        integrity = integrity
        canonical_id = get_default_canonical_id(repository_ctx, urls),
    ),

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Parameters

repository_ctxrequired.

The repository context of the repository rule calling this utility function.

urlsrequired.

A list of URLs matching what is passed to repository_ctx.download and repository_ctx.download_and_extract.