## Variável de Ambiente `PATH`

Existe uma variável de ambiente **especial** chamada **`PATH`** que é usada pelos sistemas operacionais (Linux, macOS, Windows) para encontrar programas para executar.

O valor da variável `PATH` é uma longa string composta por diretórios separados por dois pontos `:` no Linux e macOS, e por ponto e vírgula `;` no Windows.

"میان‌افزار" یک تابع است که با هر درخواست(request) قبل از پردازش توسط هر path operation (عملیات مسیر) خاص کار می‌کند. همچنین با هر پاسخ(response) قبل از بازگشت آن نیز کار می‌کند.

* هر **درخواستی (request)** که به برنامه شما می آید را می گیرد.
* سپس می تواند کاری برای آن **درخواست** انجام دهید یا هر کد مورد نیازتان را اجرا کنید.
* سپس **درخواست** را به بخش دیگری از برنامه (توسط یک path operation مشخص) برای پردازش ارسال می کند.

    private final ParserRequest parserRequest;
    private final Path cwd;
    private final Path installationDirectory;
    private final Path userHomeDirectory;
    private final Map<String, String> userProperties;
    private final Map<String, String> systemProperties;
    private final Path topDirectory;
    private final Path rootDirectory;

    private final InputStream in;
    private final OutputStream out;

# Body - Multiple Parameters

Now that we have seen how to use `Path` and `Query`, let's see more advanced uses of request body declarations.

## Mix `Path`, `Query` and body parameters

First, of course, you can mix `Path`, `Query` and request body parameter declarations freely and **FastAPI** will know what to do.

And you can also declare body parameters as optional, by setting the default to `None`:

//// tab | Python 3.10+

    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/": {
                "get": {
                    "responses": {
                        "200": {
                            "description": "Successful Response",

if .Values.consoleIngress.tls }} tls: {{- range .Values.consoleIngress.tls }} - hosts: {{- range .hosts }} - {{ . | quote }} {{- end }} secretName: {{ .secretName }} {{- end }} {{- end }} rules: {{- range .Values.consoleIngress.hosts }} - http: paths: - path: {{ $ingressPath }} {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }} pathType: Prefix backend: service: name: {{ $fullName }} port: number: {{ $servicePort }} {{- else }} backend: serviceName: {{ $fullName }} servicePort:...

if .Values.consoleIngress.tls }} tls: {{- range .Values.consoleIngress.tls }} - hosts: {{- range .hosts }} - {{ . | quote }} {{- end }} secretName: {{ .secretName }} {{- end }} {{- end }} rules: {{- range .Values.consoleIngress.hosts }} - http: paths: - path: {{ $ingressPath }} {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }} pathType: Prefix backend: service: name: {{ $fullName }} port: number: {{ $servicePort }} {{- else }} backend: serviceName: {{ $fullName }} servicePort:...

if .Values.consoleIngress.tls }} tls: {{- range .Values.consoleIngress.tls }} - hosts: {{- range .hosts }} - {{ . | quote }} {{- end }} secretName: {{ .secretName }} {{- end }} {{- end }} rules: {{- range .Values.consoleIngress.hosts }} - http: paths: - path: {{ $ingressPath }} {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }} pathType: Prefix backend: service: name: {{ $fullName }} port: number: {{ $servicePort }} {{- else }} backend: serviceName: {{ $fullName }} servicePort:...

    List<ProtwordsItem> protwordsItemList;

    public ProtwordsFile(final String id, final String path, final Date timestamp) {
        super(id, path, timestamp);
    }

    @Override
    public String getType() {
        return PROTWORDS;
    }

    @Override
    public String getPath() {
        return path;
    }

    @Override
    public synchronized OptionalEntity<ProtwordsItem> get(final long id) {

    List<StopwordsItem> stopwordsItemList;

    public StopwordsFile(final String id, final String path, final Date timestamp) {
        super(id, path, timestamp);
    }

    @Override
    public String getType() {
        return STOPWORDS;
    }

    @Override
    public String getPath() {
        return path;
    }

    @Override
    public synchronized OptionalEntity<StopwordsItem> get(final long id) {