## Mounting a **FastAPI** application { #mounting-a-fastapi-application }

"Mounting" means adding a completely "independent" application in a specific path, that then takes care of handling everything under that path, with the _path operations_ declared in that sub-application.

### Top-level application { #top-level-application }

First, create the main, top-level, **FastAPI** application, and its *path operations*:

This tool will help you to automatically change most of the code that needs to be changed.

After this, you can run the tests and check if everything works. If it does, you are done. 😎

## Pydantic v1 in v2 { #pydantic-v1-in-v2 }

Pydantic v2 includes everything from Pydantic v1 as a submodule `pydantic.v1`. But this is no longer supported in versions above Python 3.13.

You would probably do this just once, the first time, when setting everything up.

/// tip

This Domain Name part is way before HTTPS, but as everything depends on the domain and the IP address, it's worth mentioning it here.

///

### DNS { #dns }

Now let's focus on all the actual HTTPS parts.

It's also possible to declare the list as `"*"` (a "wildcard") to say that all are allowed.

But that will only allow certain types of communication, excluding everything that involves credentials: Cookies, Authorization headers like those used with Bearer Tokens, etc.

So, for everything to work correctly, it's better to specify explicitly the allowed origins.

## Use `CORSMiddleware` { #use-corsmiddleware }

# Bigger Applications - Multiple Files { #bigger-applications-multiple-files }

If you are building an application or a web API, it's rarely the case that you can put everything in a single file.

**FastAPI** provides a convenience tool to structure your application while keeping all the flexibility.

/// info

If you come from Flask, this would be the equivalent of Flask's Blueprints.

///

## An example file structure { #an-example-file-structure }

* `.gitignore`: the name of the file where the text should be written

And `*` for Git means "everything". So, it will ignore everything in the `.venv` directory.

That command will create a file `.gitignore` with the content:

```gitignore
*
```

///

## Install Packages { #install-packages }

          # To verify the change, run the build with:
          # @bot-gradle test ReadyForNightly
          # ```
          # stopGradleDaemons=true
          # ```
          EOF
          # Append everything from "version:" onwards
          sed -n '/^version:/,$p' .teamcity/jdks.yaml >> .teamcity/jdks.yaml.tmp
          mv .teamcity/jdks.yaml.tmp .teamcity/jdks.yaml
      - name: Create Pull Request
        id: create-pull-request

Swagger UI will handle it behind the scenes for you, but it needs this "redirect" helper.

///

### Create a *path operation* to test it { #create-a-path-operation-to-test-it }

Now, to be able to test that everything works, create a *path operation*:

{* ../../docs_src/custom_docs_ui/tutorial001_py39.py hl[36:38] *}

### Test it { #test-it }

### French instructions about technical terms

                }
            } else if (className.equals(allowedPattern)) {
                return ObjectInputFilter.Status.ALLOWED;
            }
        }

        // Reject everything else
        return ObjectInputFilter.Status.REJECTED;
    };

    /**
     * Tests if the object can be serialized.
     *
     * @param obj the object to be serialized (must not be {@literal null})