OAuth 2.0 Bearer Token Usage (2024)

FAQs

Is currently a limit of 100 refresh tokens per Google account per OAuth 2.0 client ID? ›

Yes, your unique client-id has a limit of 100 refresh tokens. But if the limit is reached, creating a new token will automatically invalidate the oldest refresh token without any warning.

The purpose of OAuth2 Tokens is to authorize requests at a first-party server (or API). If the third party uses the OAuth2 Access Token as proof of authentication, an attacker could easily impersonate a legitimate user.

It depends... by default, each time you refresh token, it returns new access token and new refresh token. If you're talking about old refresh token, it only available one time. But from client side, there is no limitation, you can always refresh as soon as the refresh token is not expired.

Limitations. Auth0 limits the amount of active refresh tokens to 200 tokens per user per application.

It states that OAuth 2.0 is deprecated.

Challenges with access/bearer tokens

Access is granted based on the validity of the token. There is no validation that the bearer is in fact the legitimate owner of the token. This is one of the main vulnerabilities of a bearer token.

If the OAuth service fails to validate this URI properly, an attacker may be able to construct a CSRF-like attack, tricking the victim's browser into initiating an OAuth flow that will send the code or token to an attacker-controlled redirect_uri .

API key - Use for server-to-server communications, accessing public data like a weather API, integrating with 3rd party systems. Token - Use for user authentication, fine-grained access control (FGAC), granting temporary access to resources, browser access, and managing user sessions.

Even though there are a similarities, there's also differences Access tokens are credentials used to access protected resources. Access tokens are used as bearer tokens. A bearer token means that the bearer (who holds the access token) can access authorized resources without further identification.

Don't pass bearer tokens in page URLs: Bearer tokens SHOULD NOT be passed in page URLs (for example, as query string parameters). Instead, bearer tokens SHOULD be passed in HTTP message headers or message bodies for which confidentiality measures are taken.

How can I get Bearer Token automatically? ›

Use a programming language (like Python or JavaScript) to automatically send this URL request. The Bearer Token acts as your signature to get a response. Receive the List: Just like getting a package in the mail, your program receives a response.

OAuth 2.0 clients for web apps must secure their data using HTTPS redirect URIs and JavaScript origins, not plain HTTP. Google can reject OAuth requests that don't originate from or resolve to a secure context.

Client ID value used for the authorization server to authenticate the client. Length of client ID. The maximum value is 256.

50,000 requests per project per day, which can be increased. 10 queries per second (QPS) per IP address. In the API Console, there is a similar quota referred to as Requests per 100 seconds per user. By default, it is set to 100 requests per 100 seconds per user and can be adjusted to a maximum value of 1,000.