build tensorflow serving 1.15 error with "Download from https://mirror.bazel.build/github.com/tensorflow/tensorflow/archive/*.tar.gz failed"

[ghtwht]

I was building tensorflow serving 1.15 with custom ops， and came across the error "Download from https://mirror.bazel.build/github.com/tensorflow/tensorflow/archive/*commit number*.tar.gz failed"
I edited the message under serving/WORKSPACE :

load("//tensorflow_serving:repo.bzl", "tensorflow_http_archive")

tensorflow_http_archive(
name = "org_tensorflow",
sha256 = "cbbdc0b509b660391940fd963574320bc4c75827cbae898cc1f9d1398a064e59",
git_commit = "df8c55ce12b5cfc6f29b01889f7773911a75e6ef",
)
but it always occurs " Download from https://mirror.bazel.build/github.com/tensorflow/tensorflow/archive/df8c55ce12b5cfc6f29b01889f7773911a75e6ef.tar.gz failed: class java.io.FileNotFoundException GET returned 404 Not Found"
where and how can I get the right commit and sha256 information? thanks...

[Hanyu-Jin]

Hi, does this problem solved？