## `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()`

For many scenarios, you can handle security (authorization, authentication, etc.) with dependencies, using `Depends()`.

    inputs.files("apiSourceFolders", apiSourceFolders)
    inputs.files(currentClasspath)
    inputs.files(extractGradleApiInfo)

    newClasspath.from(currentClasspath)
    oldClasspath.from(configurations.baselineClasspath)

    newArchives.from(currentDistroJars)
    oldArchives.from(baselineJars)

    // binary breaking change checking setup
    onlyModified = false

      exercising permissions granted by this License.

      "Source" form shall mean the preferred form for making modifications,
      including but not limited to software source code, documentation
      source, and configuration files.

      "Object" form shall mean any form resulting from mechanical
      transformation or translation of a Source form, including but
      not limited to compiled object code, generated documentation,

    isVisible = false
    isCanBeResolved = false
    isCanBeConsumed = false
    description = "Dependencies to aggregate reports from"
}

val allIncubationReports = tasks.register<IncubatingApiAggregateReportTask>("allIncubationReports") {
    group = "verification"
    reports.from(resolver("txt"))
    htmlReportFile = project.layout.buildDirectory.file("reports/incubation/all-incubating.html")
}

   prevent flakiness from multiple threads concurrently accessing a stream.

## Version 1.5.3

_2014-03-29_

 * Fix bug where the Content-Length header was not always dropped when
   following a redirect from a POST to a GET.
 * Implement basic support for `Thread.interrupt()`. OkHttp now checks
   for an interruption before doing a blocking call. If it is interrupted,
   it throws an `InterruptedIOException`.

  // a list starting from the next key, but from the latest snapshot, which is inconsistent from the
  // previous list results - objects that are created, modified, or deleted after the first list request
  // will be included in the response, as long as their keys are after the "next key".
  //
  // This field is not supported when watch is true. Clients may start a watch from the last

val parameterNamesIndex by tasks.registering(ParameterNamesIndex::class) {
    sources.from(
        main.allJava.matching {
            include(PublicApi.includes)
            exclude(PublicApi.excludes)
        }
    )
    classpath.from(main.compileClasspath)
    classpath.from(tasks.named<JavaCompile>("compileJava"))
    classpath.from(tasks.named<GroovyCompile>("compileGroovy"))

    MINIO_CONFIG_ENV_FILE=config.env \
    MC_CONFIG_DIR=/tmp/.mc

COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=build /go/bin/minio /usr/bin/minio
COPY --from=build /go/bin/mc /usr/bin/mc
COPY --from=build /go/bin/cur* /usr/bin/

COPY CREDITS /licenses/CREDITS
COPY LICENSE /licenses/LICENSE

# First, set your TFCI variable to choose the environment settings.
#   TFCI is a comma-separated list of filenames from the envs directory, which
#   are all settings for the scripts. TF's CI jobs are all made of a combination
#   of these env files.
#
#   If you've clicked on a test result from our CI (via a dashboard or GitHub link),
#   click to "Invocation Details" and find BUILD_CONFIG, which will contain a TFCI

## Example upgrade

Now modify the file `main.py` to receive a body from a `PUT` request.

Declare the body using standard Python types, thanks to Pydantic.

```Python hl_lines="4  9-12  25-27"
from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float