Storage.readAllBytes() unauthorized when running on App Engine standard with default credentials

[clementdenis]

Create an application running this code:

StorageOptions.defaultInstance().service().readAllBytes(bucket, objectName)

It will work on a local environment using application default credentials, but it will throw the following error when deployed on App Engine standard (did not try on flexible):

com.google.cloud.storage.StorageException: 401
Login Required
    at com.google.cloud.storage.spi.DefaultStorageRpc.translate(DefaultStorageRpc.java:98)
    at com.google.cloud.storage.spi.DefaultStorageRpc.load(DefaultStorageRpc.java:362)
    at com.google.cloud.storage.StorageImpl$16.call(StorageImpl.java:443)
    at com.google.cloud.storage.StorageImpl$16.call(StorageImpl.java:440)
    at com.google.cloud.RetryHelper.doRetry(RetryHelper.java:181)
    at com.google.cloud.RetryHelper.runWithRetries(RetryHelper.java:247)
    at com.google.cloud.RetryHelper.runWithRetries(RetryHelper.java:237)
    at com.google.cloud.storage.StorageImpl.readAllBytes(StorageImpl.java:440)

The workaround is to use Storage.reader() to get a ReadChannel.

[mziccard]

This is strange and I believe it does not depend on us. I need to do some digging but I might have a fix.

[mziccard]

@clementdenis Would you mind giving a try to #1010? that should fix the readAllBytes issue.