# Request Parameters

Here's the reference information for the request parameters.

These are the special functions that you can put in *path operation function* parameters or dependency functions with `Annotated` to get data from the request.

It includes:

* `Query()`
* `Path()`
* `Body()`
* `Cookie()`
* `Header()`
* `Form()`
* `File()`

You can import them all directly from `fastapi`:

```python

You can define event handlers (functions) that need to be executed before the application starts up, or when the application is shutting down.

These functions can be declared with `async def` or normal `def`.

### `startup` event

To add a function that should be run before the application starts, declare it with the event `"startup"`:

```Python hl_lines="8"

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package sha3

// This file provides functions for creating instances of the SHA-3
// and SHAKE hash functions, as well as utility functions for hashing
// bytes.

import (
	"hash"
)

// New224 creates a new SHA3-224 hash.
// Its generic security strength is 224 bits against preimage attacks,

     * For regular classes, implicit default constructor is generated
     * For data classes the `copy`, `component{N}`, `toString`, `equals`, `hashCode` functions are generated
     * For enum classes the `valueOf` & `values` functions are generated
     * For lambda the `it` implicit parameter is generated
     */
    SOURCE_MEMBER_GENERATED,

    /**
     * A Kotlin declaration came from some .class file

				for _, line := range loc.Line {
					fns = append(fns, fmt.Sprintf("%s:%d", line.Function.Name, line.Line))
					leaf = line.Function.Name
				}
			}
			// runtime.sigprof synthesizes call stacks when "normal traceback is
			// impossible or has failed", using particular placeholder functions
			// to represent common failure cases. Look for those functions in
			// the leaf position as a sign that the call stack and its

    }

    private static boolean isKotlinFunction0Deferrable(@Nullable Object value) {
        return value instanceof kotlin.jvm.functions.Function0;
    }

    @Nullable
    private static Object unpackKotlinFunction0(Object value) {
        return ((kotlin.jvm.functions.Function0) value).invoke();
    }

	}

	// First compute inlinability of all functions in the package.
	inline.CanInlineFuncs(pkg.Funcs, inlProfile)

	// Now we make a second pass to do devirtualization and inlining of
	// calls. Order here should not matter.
	for _, fn := range pkg.Funcs {
		DevirtualizeAndInlineFunc(fn, inlProfile)
	}

	if base.Flag.LowerL != 0 {
		// Perform a garbage collection of hidden closures functions that

// After applying the function, a quantize/dequantize functions are created
// where the body of each function contains a specific quantization algorithm.
// The input of the quantize function has one operand of
// IsValueWithQuantizablePrecision and the output is a tensor with supported
// quantized precision (like int8). For dequantize function, it is the other way
// around.

	RF_PANIC                          // body of loop is either currently running, or has panicked
	RF_EXHAUSTED                      // iterator function return, i.e., sequence is "exhausted"
	RF_MISSING_PANIC = 4              // body of loop panicked but iterator function defer-recovered it away

/**
 * Provides type discovery via functions that return an object or configure an object accepting a lambda as the last parameter
 * (via [org.gradle.api.Action] or a Kotlin function type, see [gradleConfigureLambdas]).
 *
 * All configured or returned types that appear in [isPublicAndRestricted]-matching will be discovered (for now, regardless of actual function semantics).
 */
internal