# Path Operation Configuration { #path-operation-configuration }

There are several parameters that you can pass to your *path operation decorator* to configure it.

/// warning

Notice that these parameters are passed directly to the *path operation decorator*, not to your *path operation function*.

///

## Response Status Code { #response-status-code }

You can define the (HTTP) `status_code` to be used in the response of your *path operation*.

# Header Parameters { #header-parameters }

You can define Header parameters the same way you define `Query`, `Path` and `Cookie` parameters.

## Import `Header` { #import-header }

First import `Header`:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[3] *}

## Declare `Header` parameters { #declare-header-parameters }

Then declare the header parameters using the same structure as with `Path`, `Query` and `Cookie`.

                    clientMaxWindowBits = value?.toIntOrNull()
                    if (clientMaxWindowBits == null) unexpectedValues = true // Not an int!
                  }
                  name.equals("client_no_context_takeover", ignoreCase = true) -> {
                    if (clientNoContextTakeover) unexpectedValues = true // Repeated parameter!

                return null;
            }
        };

        // Test with string parameter
        Map<String, Object> stringParams = new HashMap<>();
        stringParams.put("string", "test");
        assertNotNull(queryRescorer.evaluate(stringParams));

        // Test with number parameter
        Map<String, Object> numberParams = new HashMap<>();
        numberParams.put("number", 123);

        } ?: return // Expected a value.

      val replaced = parameters.put(peek, parameterValue)
      peek = null
      if (replaced != null) return // Unexpected duplicate parameter.
      if (!skipCommasAndWhitespace() && !exhausted()) return // Expected ',' or EOF.
    }
    result.add(Challenge(schemeName, parameters))
  }
}

/** Returns true if any commas were skipped. */

        df.setRoundingMode(RoundingMode.HALF_UP);
        return df.format(target) + unit;
    }

    /**
     * Generates URL query parameters for pagination, excluding the specified query parameter.
     *
     * @param query the query parameter to exclude from paging
     * @return URL-encoded query string for pagination
     */
    public static String pagingQuery(final String query) {

    /** URL parameter associated with the error */
    public String url;

    /** Number of results parameter */
    public String num;

    /** Sort order parameter for search results */
    public String sort;

    /** Language parameter for search interface */
    public String lang;

    /**
     * Default constructor for ErrorForm.
     */
    public ErrorForm() {
        super();
    }

Nesses casos, você pode usar o parâmetro `response_model` do *decorador de operação de rota*  em vez do tipo de retorno.

Você pode usar o parâmetro `response_model` em qualquer uma das *operações de rota*:

* `@app.get()`
* `@app.post()`
* `@app.put()`
* `@app.delete()`
* etc.

* The alternative documentation will also reflect the new query parameter and body:

![ReDoc](https://fastapi.tiangolo.com/img/index/index-06-redoc-02.png)

### Recap { #recap }

In summary, you declare **once** the types of parameters, body, etc. as function parameters.

You do that with standard modern Python types.

    private int currentPageNumber;

    /** Search/filter parameter for duplicate host configuration ID. */
    public String id;

    /** Search/filter parameter for regular hostname pattern. */
    public String regularName;

    /** Search/filter parameter for duplicate hostname pattern. */
    public String duplicateHostName;

    /** Search/filter parameter for duplicate host sort order. */
    public String sortOrder;