Y quieres tener una forma para que el frontend se autentique con el backend, usando un **username** y **password**.

Podemos usar **OAuth2** para construir eso con **FastAPI**.

Pero vamos a ahorrarte el tiempo de leer la larga especificación completa solo para encontrar esos pequeños fragmentos de información que necesitas.

Usemos las herramientas proporcionadas por **FastAPI** para manejar la seguridad.

## Cómo se ve { #how-it-looks }

      if (npe.message == NPE_THROW_WITH_NULL) {
        throw IOException(npe)
      }
    }
  }

  /**
   * Does all the work to build an HTTPS connection over a proxy tunnel. The catch here is that a
   * proxy server can issue an auth challenge and then close the connection.
   *
   * @return the next plan to attempt, or null if no further attempt should be made either because

      new RegularImmutableMap<>((Entry<Object, Object>[]) ImmutableMap.EMPTY_ENTRY_ARRAY, null, 0);

  /**
   * Closed addressing tends to perform well even with high load factors. Being conservative here
   * ensures that the table is still likely to be relatively sparse (hence it misses fast) while
   * saving space.
   */
  @VisibleForTesting static final double MAX_LOAD_FACTOR = 1.2;

  /**

                this.state = 6;
                ioe = ioe0;
            }
        case 4: /* failed to connect - reset the transport */
            // thread is cleaned up by connect routine, joining it here causes a deadlock
            this.thread = null;
            this.state = 6;
            break;
        default:
            log.error("Invalid state: " + this.state);
            this.thread = null;

    }

    // Test constant field values
    public void xtest_constantFields() {
        assertEquals("lasta_di.smart.deploy.mode", FessEnv.lasta_di_SMART_DEPLOY_MODE);
        assertEquals("development.here", FessEnv.DEVELOPMENT_HERE);
        assertEquals("environment.title", FessEnv.ENVIRONMENT_TITLE);
        assertEquals("framework.debug", FessEnv.FRAMEWORK_DEBUG);

    at com.android.org.conscrypt.NativeCrypto.SSL_do_handshake(Native Method)
```

You can check a web server's configuration using [Qualys SSL Labs][qualys]. OkHttp's TLS
configuration history is [tracked here](../security/tls_configuration_history.md).

Applications expected to be installed on older Android devices should consider adopting the

    return new FunctionToCacheLoader<>(function);
  }

  /**
   * Returns a cache loader based on an <i>existing</i> supplier instance. Note that there's no need
   * to create a <i>new</i> supplier just to pass it in here; just subclass {@code CacheLoader} and
   * implement {@link #load load} instead.
   *
   * <p>The returned object is serializable if {@code supplier} is serializable.
   *

   * with any fraction rounded down.
   *
   * <p><b>Note:</b> the overhead of measurement can be more than a microsecond, so it is generally
   * not useful to specify {@link TimeUnit#NANOSECONDS} precision here.
   *
   * <p>It is generally not a good idea to use an ambiguous, unitless {@code long} to represent
   * elapsed time. Therefore, we recommend using {@link #elapsed()} instead, which returns a

            dr.pathConsumed = consumed;

            /*
             * Samba has a tendency to return pathConsumed values so that they consume a trailing slash of the
             * requested path. Normalize this here.
             */
            if (reqPath.charAt(consumed - 1) == '\\') {
                if (log.isDebugEnabled()) {
                    log.debug("Server consumed trailing slash of request path, adjusting");

				if unlock, ok := val.(chan struct{}); ok && unlock != nil {
					// Wait until unfrozen.
					select {
					case <-unlock:
					case <-r.Context().Done():
						// if client canceled we don't need to wait here forever.
						return
					}
				}
			}
		}

		globalHTTPStats.addRequestsInQueue(1)
		pool := globalAPIConfig.getRequestsPool()
		if pool == nil {
			globalHTTPStats.addRequestsInQueue(-1)