# Segurança - Primeiros Passos { #security-first-steps }

Vamos imaginar que você tem a sua API de **backend** em algum domínio.

E você tem um **frontend** em outro domínio ou em um path diferente no mesmo domínio (ou em uma aplicação mobile).

E você quer uma maneira de o frontend autenticar com o backend, usando um **username** e **password**.

Podemos usar **OAuth2** para construir isso com o **FastAPI**.

   * 8`, so the class files from that build can't express nestmates. Thus, when those class files
   * are used from Java 9 or higher (i.e., high enough to trigger the VarHandle code path), such a
   * lookup would fail with an IllegalAccessException. That may then trigger use of Unsafe (possibly
   * with a warning under recent JVMs), or it may fall back even further to

                break;
            }

            log.info("Processing async notification: {} for {}", eventType, notification.getResourceName());

            // Process the notification through the standard path
            processNotification(notification);

        } catch (Exception e) {
            log.error("Error processing async notification message", e);
        }
    }

    /**

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      same "printed page" as the copyright notice for easier
      identification within third-party archives.

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   Licensed under the Apache License, Version 2.0 (the "License");

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    /** Whether DFS support is disabled */
    protected boolean dfsDisabled = false;
    /** DFS cache time-to-live in seconds */
    protected long dfsTTL = 300;
    /** Whether to use strict DFS path resolution */
    protected boolean dfsStrictView = false;
    /** Whether to convert DFS paths to FQDN */
    protected boolean dfsConvertToFqdn;
    /** Default logon share */
    protected String logonShare;

        // Create a spy to track method calls
        SmbTreeConnection c = spy(newConn());

        // Prepare a minimal locator
        SmbResourceLocatorImpl loc = new SmbResourceLocatorImpl(ctx, smbUrl("smb://srv/share/path"));

        // Setup a tree that will fail with transport error first, then succeed
        SmbTreeImpl tree = mock(SmbTreeImpl.class);
        when(tree.acquire(false)).thenReturn(tree);