Hello!
I am having a very similar issue as in #1094, however it is just the protocol of the host which is not respected. In the example below I specify "http://example.com" but the signed url is towards "https://example.com". I don't know enough about this topic to know if https is required, for local development we are using http so I have to replace the protocol when signing urls locally towards a fake gcs server https://github.com/fsouza/fake-gcs-server. Let me know!

Environment details

• Running on Ubuntu 24.04.1 LTS
• Java version 21
• com.google.cloud:libraries-bom, version = "26.52.0"

Code example

Storage storage = StorageOptions.getDefaultInstance().toBuilder().setHost("http://example.com/").build().getService();
BlobInfo blobInfo = BlobInfo.newBuilder(BlobId.of("bucket", "object")).build()
URL signedUrl =  storage.signUrl(
                                          blobInfo,
                                          1,
                                          TimeUnit.HOURS,
                                          SignUrlOption.signWith(credentials),
                                          SignUrlOption.withV4Signature());

Produces a signed url which starts with:
https://example.com/bucket/object?X-Goog-Algorithm=...

Thanks!