}
                    }
                    totalPolled.addAndGet(count);
                } catch (final InterruptedException e) {
                    Thread.currentThread().interrupt();
                } finally {
                    doneLatch.countDown();
                }
            }).start();
        }

        startLatch.countDown();
        doneLatch.await();

            task.start();
            task.join(timeout);
            if (!done.get()) {
                for (int i = 0; i < 100 && !done.get(); i++) {
                    task.interrupt();
                    ThreadUtil.sleep(100L);
                }
                throw new ExtractException("PDFBox process cannot finish in " + timeout + " sec.");
            }

    Note over Server: Server interprets headers<br/>(if --forwarded-allow-ips is set)

    Server->>Proxy: HTTP Response<br/>with correct HTTPS URLs

    Proxy->>Client: HTTPS Response
```

The **proxy** intercepts the original client request and adds the special *forwarded* headers (`X-Forwarded-*`) before passing the request to the **application server**.

    Note over Server: Server interprets headers<br/>(if --forwarded-allow-ips is set)

    Server->>Proxy: HTTP Response<br/>with correct HTTPS URLs

    Proxy->>Client: HTTPS Response
```

O **proxy** intercepta a requisição original do cliente e adiciona os headers especiais de encaminhamento (`X-Forwarded-*`) antes de repassar a requisição para o **servidor da aplicação**.

                            }
                        });
                        successCount.incrementAndGet();
                    } catch (InterruptedException e) {
                        Thread.currentThread().interrupt();
                    } catch (CIFSException e) {
                        if (e.getMessage().contains("backpressure")) {
                            rejectedCount.incrementAndGet();
                        }

            throw new CrawlerSystemException("Process terminated.", e);
        } finally {
            if (mt != null) {
                mt.setFinished(true);
                try {
                    mt.interrupt();
                } catch (final Exception e) {}
            }
            if (currentProcess != null) {
                try {
                    currentProcess.destroy();

                    cleanupExecutor.shutdownNow();
                }
            } catch (InterruptedException e) {
                cleanupExecutor.shutdownNow();
                Thread.currentThread().interrupt();
            }
        }

        // Clean up expired weak references
        cleanupExpiredReferences();

        // Release all leases
        releaseAll();

        // Clear file cache

                        assertTrue(pwd == null || pwd.equals("ConcurrentPass123!"));
                    }
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                }
            });
        }

        // Start all threads
        for (Thread t : threads) {
            t.start();
        }

        // Wait for all threads to complete

  /**
   * The HTTP nonstandard {@code X-Content-Security-Policy} header field name. It was introduced in
   * <a href="https://www.w3.org/TR/2011/WD-CSP-20111129/">CSP v.1</a> and used by the Firefox until
   * version 23 and the Internet Explorer version 10. Please, use {@link #CONTENT_SECURITY_POLICY}
   * to pass the CSP.
   *
   * @since 20.0
   */
  public static final String X_CONTENT_SECURITY_POLICY = "X-Content-Security-Policy";

  /**

Es wurde erstellt, um den HTML-Code im Backend zu generieren, nicht um APIs zu erstellen, die von einem modernen Frontend (wie React, Vue.js und Angular) oder von anderen Systemen (wie <abbr title="Internet of Things – Internet der Dinge">IoT</abbr>-Geräten) verwendet werden, um mit ihm zu kommunizieren.

### <a href="https://www.django-rest-framework.org/" class="external-link" target="_blank">Django REST Framework</a> { #django-rest-framework }