* IllegalStateException} if it is accessed in any way, with the following exceptions:
   *
   * <ul>
   *   <li>{@code view.equals(view)} evaluates to {@code true} (but any other {@code equals()}
   *       expression involving {@code view} will throw)
   *   <li>{@code hashCode()} does not throw
   *   <li>if {@code node} is re-added to the network after having been removed, {@code view}'s

Adding an `\f` (an escaped "form feed" character) causes **FastAPI** to truncate the output used for OpenAPI at this point.

It won't show up in the documentation, but other tools (such as Sphinx) will be able to use the rest.

```Python hl_lines="19-29"
{!../../docs_src/path_operation_advanced_configuration/tutorial004.py!}
```

## Additional Responses

When referring to the remote machine, it's common to call it **server**, but also **machine**, **VM** (virtual machine), **node**. Those all refer to some type of remote machine, normally running Linux, where you run programs.

## Install the Server Program

When you install FastAPI, it comes with a production server, Uvicorn, and you can start it with the `fastapi run` command.

But you can also install an ASGI server manually.

	AssertAssociationCount(t, users, "Account", 2, "")

	// Find
	var accounts []Account
	if DB.Model(&users).Association("Account").Find(&accounts); len(accounts) != 2 {
		t.Errorf("accounts count should be %v, but got %v", 3, len(accounts))
	}

	// Append
	DB.Model(&users).Association("Account").Append(
		&Account{Number: "account-slice-append-1"},
		&Account{Number: "account-slice-append-2"},

# WebSockets

When defining WebSockets, you normally declare a parameter of type `WebSocket` and with it you can read data from the client and send data to it.

It is provided directly by Starlette, but you can import it from `fastapi`:

```python
from fastapi import WebSocket
```

/// tip

import com.google.errorprone.annotations.RestrictedApi;

/**
 * Pluggable interface for compiling a regex pattern. By default this package uses the {@code
 * java.util.regex} library, but an alternate implementation can be supplied using the {@link
 * java.util.ServiceLoader} mechanism.
 */
@GwtIncompatible
@ElementTypesAreNonnullByDefault
interface PatternCompiler {
  /**

import com.google.errorprone.annotations.RestrictedApi;

/**
 * Pluggable interface for compiling a regex pattern. By default this package uses the {@code
 * java.util.regex} library, but an alternate implementation can be supplied using the {@link
 * java.util.ServiceLoader} mechanism.
 */
@GwtIncompatible
@ElementTypesAreNonnullByDefault
interface PatternCompiler {
  /**

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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR