# Dependencies - `Depends()` and `Security()`

## `Depends()`

Dependencies are handled mainly with the special function `Depends()` that takes a callable.

Here is the reference for it and its parameters.

You can import it directly from `fastapi`:

```python
from fastapi import Depends
```

::: fastapi.Depends

## `Security()`

name: Upgrade old version tests

on:
  pull_request:
    branches:
      - master

# This ensures that previous jobs for the PR are canceled when the PR is
# updated.
concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  build:
    name: Go ${{ matrix.go-version }} on ${{ matrix.os }}
    runs-on: ${{ matrix.os }}
    strategy:

// Code generated by "stringer -type=TargetType -trimprefix=Target types.go"; DO NOT EDIT.

package loggertypes

import "strconv"

func _() {
	// An "invalid array index" compiler error signifies that the constant values have changed.
	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[TargetConsole-1]
	_ = x[TargetHTTP-2]
	_ = x[TargetKafka-3]
}

const _TargetType_name = "ConsoleHTTPKafka"

// Code generated by "stringer -type=batchJobMetric -trimprefix=batchJobMetric batch-handlers.go"; DO NOT EDIT.

package cmd

import "strconv"

func _() {
	// An "invalid array index" compiler error signifies that the constant values have changed.
	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[batchJobMetricReplication-0]
	_ = x[batchJobMetricKeyRotation-1]
	_ = x[batchJobMetricExpire-2]
}

// Code generated by "stringer -type=healingMetric -trimprefix=healingMetric erasure-healing.go"; DO NOT EDIT.

package cmd

import "strconv"

func _() {
	// An "invalid array index" compiler error signifies that the constant values have changed.
	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[healingMetricBucket-0]
	_ = x[healingMetricObject-1]
	_ = x[healingMetricCheckAbandonedParts-2]
}

# SHA256 checksums of snapshot zip files in this directory.
# These checksums are included in the FIPS security policy
# (validation instructions sent to the lab) and MUST NOT CHANGE.
# That is, the zip files themselves must not change.
#
# It is okay to add new zip files to the list, and it is okay to
# remove zip files from the list when they are removed from
# this directory. To update this file:
#
#	go test cmd/go/internal/fips140 -update
#

     */
    public void add(final FtpAuthentication auth) {
        if (auth != null) {
            authenticationList.add(auth);
        }
    }

    /**
     * Retrieves an FtpAuthentication object that matches the given path.
     * @param path The path to match.
     * @return The matching FtpAuthentication object, or null if no match is found.
     */
    public FtpAuthentication get(final String path) {

 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 */

 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *

 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *