Fetch-url-http-3a-2f-2fmetadata.google.internal-2fcomputemetadata-2fv1-2finstance-2fservice Accounts-2f ((link)) Now

Ensure your request includes Metadata-Flavor: Google .

To give you a better understanding of how to interact with this URL, here are some code examples:

Article structure:

Each trailing slash indicates a subdirectory that you can explore. Ensure your request includes Metadata-Flavor: Google

Without this header, the server returns a 403 Forbidden response. This protects against accidental exposure or CSRF‑style attacks from unprivileged processes.

This script had been written two years ago by a developer named David. David was pragmatic, perhaps to a fault. He needed the script to pull configuration data from a remote server. To make the script flexible, he added a feature allowing it to accept a URL as a command-line argument. It looked something like this:

Here is the detailed story of how this string came to exist, told from the perspective of the server that received it. He needed the script to pull configuration data

curl -H "Metadata-Flavor: Google" \ "http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/"

As a developer or engineer working with Google Cloud Platform (GCP), you may have stumbled upon a peculiar URL while debugging or exploring the inner workings of your application: http://metadata.google.internal/computeMetadata/v1/instance/service-accounts-/ . This enigmatic fetch URL seems to be shrouded in mystery, but fear not, for we're about to embark on a journey to unravel its secrets.

To "prepare a feature" around this functionality, you are likely looking to either implement a legitimate data-fetching mechanism for a VM or build a security-focused feature to detect or prevent SSRF attacks. 1. Functional Feature: Service Account Metadata Fetcher Here are the most important ones

The service-accounts/ endpoint is the entry point. Inside this directory, you'll find several valuable sub-paths. Here are the most important ones, all relative to our base URL:

.../token : Fetches an OAuth2 access token for the default service account. .../identity : Fetches an OpenID Connect (OIDC) ID token.

curl -H "Metadata-Flavor: Google" \ 'http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token'

Crucially, all requests to the metadata server include the header: