# Deployment

Deploying a **FastAPI** application is relatively easy.

## What Does Deployment Mean

To **deploy** an application means to perform the necessary steps to make it **available to the users**.

For a **web API**, it normally involves putting it in a **remote machine**, with a **server program** that provides good performance, stability, etc, so that your **users** can **access** the application efficiently and without interruptions or problems.

If you need to enforce it, use `OAuth2PasswordRequestFormStrict` instead of `OAuth2PasswordRequestForm`.

///

* An optional `client_id` (we don't need it for our example).
* An optional `client_secret` (we don't need it for our example).

/// info

            .filter { "UNKNOWN" != it.key }
            .filter { model.subprojects.getSubprojectByName(it.key) != null }
            .map { SubprojectTestClassTime(model.subprojects.getSubprojectByName(it.key)!!, it.value.filter { it.testClassAndSourceSet.sourceSet != "test" }) }
            .sortedBy { -it.totalTime }
            .filter { onlyNativeSubprojectsForIntelMacs(testCoverage, it.subProject.name) }

    The only difference with a regular dependency is that it can declare OAuth2
    scopes that will be integrated with OpenAPI and the automatic UI docs (by default
    at `/docs`).

    It takes a single "dependable" callable (like a function).

    Don't call it directly, FastAPI will call it for you.

    Read more about it in the

Next, the browser would verify that the response is valid and encrypted with the right cryptographic key, etc. It would then **decrypt the response** and process it.

<img src="/img/deployment/https/https07.svg">

You send it a token and it returns an authenticated user.

This provider might be charging you per request, and calling it might take some extra time than if you had a fixed mock user for tests.

You probably want to test the external provider once, but not necessarily call it for every test that runs.

    richReport({
        it.includedClasses = toPatterns(PublicApi.includes + PublicKotlinDslApi.includes)
        it.excludedClasses = toPatterns(PublicApi.excludes + PublicKotlinDslApi.excludes)

        it.title = "Binary compatibility report for Gradle ${isSnapshot.get() ? "${baseVersion.get()}-SNAPSHOT" : version} since ${compatibilityBaselineVersion}"
        it.destinationDir = file("$buildDir/reports/binary-compatibility")

/// 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.

///

```

///

* The `app` directory contains everything. And it has an empty file `app/__init__.py`, so it is a "Python package" (a collection of "Python modules"): `app`.
* It contains an `app/main.py` file. As it is inside a Python package (a directory with a file `__init__.py`), it is a "module" of that package: `app.main`.
* There's also an `app/dependencies.py` file, just like `app/main.py`, it is a "module": `app.dependencies`.

## Alternative (old): `Query` as the default value

Previous versions of FastAPI (before <abbr title="before 2023-03">0.95.0</abbr>) required you to use `Query` as the default value of your parameter, instead of putting it in `Annotated`, there's a high chance that you will see code using it around, so I'll explain it to you.

/// tip