});

        ShareEnumIterator it = new ShareEnumIterator(parent, entries.iterator(), filter);

        // Returns only accepted resources
        assertTrue(it.hasNext());
        assertEquals("keep1/", it.next().getName());
        assertTrue(it.hasNext());
        assertEquals("keep2/", it.next().getName());
        assertFalse(it.hasNext());

        // Verify filter called once per entry

      decompose = {
        listOf(
          it.version,
          it.serialNumber,
          it.signature,
          rdnSequence to it.issuer,
          it.validity,
          rdnSequence to it.subject,
          it.subjectPublicKeyInfo,
          it.issuerUniqueID,
          it.subjectUniqueID,
          it.extensions,
        )
      },
      construct = {

    public void test() throws Exception {
        final ClassIterator it = new ClassIterator(Integer.class);
        assertThat(it.hasNext(), is(true));
        assertThat(it.next(), is(sameClass(Integer.class)));

        assertThat(it.hasNext(), is(true));
        assertThat(it.next(), is(sameClass(Number.class)));

        assertThat(it.hasNext(), is(true));
        assertThat(it.next(), is(sameClass(Object.class)));

  val firefox53 = sslLabsClients.first { it.userAgent == "Firefox" && it.version == "53" }
  val firefox73 = sslLabsClients.first { it.userAgent == "Firefox" && it.version == "73" }
  val java7 = sslLabsClients.first { it.userAgent == "Java" && it.version == "7u25" }
  val java12 = sslLabsClients.first { it.userAgent == "Java" && it.version == "12.0.1" }

        // Act
        TestIterator it = TestIterator.create(tree, parent, wildcard, null, attrs, initial, pages);

        // Assert
        assertSame(tree, it.getTreeHandle(), "tree handle should be same instance returned by acquire");
        assertEquals(attrs, it.getSearchAttributes());
        assertEquals(wildcard, it.getWildcard());
        assertSame(parent, it.getParent());
        verify(tree, times(1)).acquire();

                            os to (testProject to performanceTestDuration)
                        }
                }
            }
        return pairs
            .groupBy({ it.first }, { it.second })
            .mapValues { entry -> entry.value.groupBy({ it.first }, { it.second }) }
    }

    private fun readPerformanceTestConfigurations(performanceTestsCiJson: File): List<PerformanceTestConfiguration> {

It used custom types in its declarations instead of standard Python types, but it was still a huge step forward.

It also was one of the first frameworks to generate a custom schema declaring the whole API in JSON.

It was not based on a standard like OpenAPI and JSON Schema. So it wouldn't be straightforward to integrate it with other tools, like Swagger UI. But again, it was a very innovative idea.

Let's use the tools provided by **FastAPI** to handle security.

## How it looks { #how-it-looks }

Let's first just use the code and see how it works, and then we'll come back to understand what's happening.

## Create `main.py` { #create-main-py }

Copy the example in a file `main.py`:

{* ../../docs_src/security/tutorial001_an_py39.py *}

## Run it { #run-it }

/// info

freetls.fastly.net
frei.no
freight.aero
frenchkiss.jp
fresenius
friuli-v-giulia.it
friuli-ve-giulia.it
friuli-vegiulia.it
friuli-venezia-giulia.it
friuli-veneziagiulia.it
friuli-vgiulia.it
friuliv-giulia.it
friulive-giulia.it
friulivegiulia.it
friulivenezia-giulia.it
friuliveneziagiulia.it
friulivgiulia.it
frl
frogans
frogn.no
froland.no
from-ak.com
from-al.com

/// tip

...Although if the whole application is just **crashing immediately** it probably doesn't make sense to keep restarting it forever. But in those cases, you will probably notice it during development, or at least right after deployment.

So let's focus on the main cases, where it could crash entirely in some particular cases **in the future**, and it still makes sense to restart it.

///