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+---
+title: App and API Protection SDK for Go
+further_reading:
+- link: "https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec"
+  tag: "Documentation"
+  text: "Go Security API docs"
+- link: "/security/application_security/add-user-info/"
+  tag: "Documentation"
+  text: "Adding user information to traces"
+- link: 'https://github.com/DataDog/dd-trace-go'
+  tag: "Source Code"
+  text: 'Tracer source code'
+- link: "/security/application_security/troubleshooting"
+  tag: "Documentation"
+  text: "Troubleshooting App and API Protection"
+---
+
+# SDK
+
+Sometimes, instrumenting your application automatically using [orchestrion][1] is not enough.
+That is why we offer an API under [github.com/DataDog/dd-trace-go/v2/appsec][2] for more flexibility and more features
+that would not always be available.
+
+## Preamble: errors
+
+The API is designed to return errors when something goes wrong, so you can handle them in your code. More specifically
+an error of type [`events.BlockingSecurityEvent`][3] will be returned when a blocking event occurs, such as a user being
+blocked or a request being blocked.
+
+**It is imperative to not write any response to the client when you receive a `BlockingEvent` error**, otherwise to are
+potentially sending sensitive information to an attacker. A helper called [`events.IsSecurityError`][4] is here to help
+this process. AAP SDK is designed to send a blocking response in your stead (by default, a HTTP 403) when a
+`BlockingSecurityEvent` is returned. Customizing this behaviour is possible, more available in
+the [Customize response to blocked requests][5] section.
+
+## HTTP Body Monitoring
+
+By default, a lot of Go HTTP Frameworks are not high level enough to provide parsed HTTP request & response bodies.
+This is why AAP SDK provides a way to monitor the HTTP request and response bodies manually:
+
+- [`appsec.MonitorRequestBody`][8] to monitor the request body.
+- [`appsec.MonitorHTTPResponseBody`][9] to monitor the response body.
+
+These functions will automatically block the current request if asked from Datadog's UI, and return a
+`BlockingSecurityEvent` error.
+
+## User tracking
+
+When a user logs in to your application, it is important to track this event for security purposes.
+The AAP offer a feature to [track and block login requests][1]. This feature is available under 2 functions:
+
+- [`appsec.TrackUserLoginSuccess`][2] to track a successful login event on your login endpoint.
+- [`appsec.TrackUserLoginFailure`][6] to track an attempted login event on your login endpoint.
+- [`appsec.SetUser`][7] use on all authenticated requests to report users to Datadog.
+
+These functions will automatically block the user if asked from Datadog's UI, and return a `BlockingSecurityEvent`
+error.
+
+## Business Logic Event Tracking
+
+User login success and failure are what is called [Business logic events][10] behind the scene which are events that
+are not directly related to security, but are important for security purposes. We offer the capability to track custom
+events using the [`appsec.TrackBusinessLogicEvent`][11] function.
+
+## Further Reading
+
+{{< partial name="whats-next/whats-next.html" >}}
+
+[1]: /security/application_security/how-it-works/add-user-info?tab=go#adding-authenticated-user-information-to-traces-and-enabling-user-blocking-capability
+[2]: https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec#TrackUserLoginSuccess
+[3]: https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec/events#BlockingSecurityEvent
+[4]: https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec/events#IsSecurityError
+[5]: /security/application_security/policies/#customize-protection-behavior
+[6]: https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec#TrackUserLoginFailure
+[7]: https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec#SetUser
+[8]: https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec#MonitorParsedHTTPBody
+[9]: https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec#MonitorHTTPResponseBody
+[10]: /security/application_security/policies/custom_rules/#business-logic-abuse-detection-rule
+[11]: https://pkg.go.dev/github.com/DataDog/dd-trace-go/v2/appsec#TrackCustomEvent