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• Using basic HTTP authentication. Provide a valid TeamCity username and password with the request. You can force basic auth by including "httpAuth" before the "/app/rest" part: e.g. http://teamcity:8111/httpAuth/app/rest/builds
• Using access to the server as a guest user (if enabled) include "guestAuth" before the "/app/rest" part: e.g.: http://teamcity:8111/guestAuth/app/rest/builds
• if you are checking REST GET requests from within a browser and you are logged in to TeamCity in the browser, you can just use "/app/rest" URL: e.g. http://teamcity:8111/app/rest/builds

There is also a workaround for not sending credentials with every requestAuthentication can be slow when not built-in authentication module is used, consider applying a workaround for reusing authentication between sequential requests.

If you perform a request from within a TeamCity build, for a limited set of build-related operations (like downloading artifacts) you can use values of teamcity.auth.userId/teamcity.auth.password system properties as credentials (within TeamCity settings you can reference them as %system.teamcity.auth.userId% and %system.teamcity.auth.password%).

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