To visit all headers, use the `Headers` class which supports access by index.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

      fun run() {
        val request = Request.Builder()

不過，在這兩種情況下，**FastAPI** [仍然很快](index.md#performance)，至少與你之前的框架相當（或者更快）。

### 依賴項(Dependencies) { #dependencies }

同樣適用於[依賴項](tutorial/dependencies/index.md)。如果依賴項是一個標準的 `def` 函式，而不是 `async def`，那麼它在外部的執行緒池被運行。

### 子依賴項 { #sub-dependencies }

在这两种情况下，与你之前的框架相比，**FastAPI** 可能[仍然很快](index.md#performance)。

### 依赖 { #dependencies }

这同样适用于[依赖](tutorial/dependencies/index.md)。如果一个依赖是标准的 `def` 函数而不是 `async def`，它将被运行在外部线程池中。

### 子依赖 { #sub-dependencies }

    }

    final class PickyIterator implements Iterator<E> {
      int expectedModCount = modCount;
      int index = 0;
      boolean canRemove;

      @Override
      public boolean hasNext() {
        checkConcurrentModification();
        return index < elements.size();
      }

      @Override
      public E next() {
        checkConcurrentModification();

                    byte[] buf = buildBuffer(der, nameBytes);
                    // Corrupt NAME_LEN to be larger than actual by +5
                    int i = 2 + 2 + der.length; // index where NAME_LEN starts
                    int fakeLen = nameBytes.length + 5;
                    buf[i] = (byte) ((fakeLen >>> 24) & 0xFF);
                    buf[i + 1] = (byte) ((fakeLen >>> 16) & 0xFF);

/// tip | Consejo

Puedes aprender más al respecto en la [documentación de despliegue](deployment/index.md).

## Explore Further

- [MinIO Admin Complete Guide](https://docs.min.io/community/minio-object-store/reference/minio-mc-admin.html)

    }

    @Test
    public void test_isFacetSortValue() {
        // Test valid facet sort values
        assertTrue(queryFieldConfig.isFacetSortValue("count"));
        assertTrue(queryFieldConfig.isFacetSortValue("index"));

        // Test invalid facet sort values
        assertFalse(queryFieldConfig.isFacetSortValue("invalid"));
        assertFalse(queryFieldConfig.isFacetSortValue(""));

		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		if dstOpts.IndexCB != nil {
			dstOpts.IndexCB = compressionIndexEncrypter(objectEncryptionKey, dstOpts.IndexCB)
		}
	}

	srcInfo.PutObjReader = pReader
	copyObjectPart := objectAPI.CopyObjectPart

	// Copy source object to destination, if source and destination

* `Field(index=True)` tells SQLModel that it should create a **SQL index** for this column, that would allow faster lookups in the database when reading data filtered by this column.