But you can return a `JSONResponse` directly from your *path operations*.

It might be useful, for example, to return custom headers or cookies.

## Return a `Response` { #return-a-response }

In fact, you can return any `Response` or any sub-class of it.

/// tip

      check(!closed) { "closed" }
      checkOffsetAndCount(source.size, 0, byteCount)
      socket.sink.write(source, byteCount)
    }

    override fun flush() {
      if (closed) return // Don't throw; this stream might have been closed on the caller's behalf.
      socket.sink.flush()
    }

    override fun close() {
      if (closed) return
      closed = true
      detachTimeout(timeout)

        try {
            String[] languages = searchHelper.getLanguages(getMockRequest(), params);

            assertNotNull(languages);
            if (languages.length > 0) {
                // Note: The actual order might be different due to normalization
                boolean hasEn = false, hasJa = false;
                for (String lang : languages) {
                    if ("en".equals(lang))
                        hasEn = true;

The whole **FastAPI** framework is based to satisfy that. Autocompletion works everywhere.

You will rarely need to come back to the docs.

Here's how your editor might help you:

* in <a href="https://code.visualstudio.com/" class="external-link" target="_blank">Visual Studio Code</a>:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

     *
     *            k * k <= x          <  (k + 1) * (k + 1)
     * (double) (k * k) <= (double) x <= (double) ((k + 1) * (k + 1))
     *          since casting to double is nondecreasing.
     *          Note that the right-hand inequality is no longer strict.
     * Math.sqrt(k * k) <= Math.sqrt(x) <= Math.sqrt((k + 1) * (k + 1))
     *          since Math.sqrt is monotonic.

   *
   * @deprecated Use {@link StandardCharsets#ISO_8859_1} instead.
   */
  @Deprecated public static final Charset ISO_8859_1 = StandardCharsets.ISO_8859_1;

  /**
   * UTF-8: eight-bit UCS Transformation Format.
   *
   * @deprecated Use {@link StandardCharsets#UTF_8} instead.
   */
  @Deprecated public static final Charset UTF_8 = StandardCharsets.UTF_8;

  /**

                        </h1>
                    </div>
                    <div class="col-sm-6">
                        <ol class="breadcrumb float-sm-right">
                            <li class="breadcrumb-item active"><la:link href="/admin/elevateword">
                                <la:message key="labels.elevate_word_link_list"/>
                            </la:link></li>

			objSize: 2 << 10,
			sizeFilter: BatchJobSizeFilter{
				UpperBound: 10 << 20,
				LowerBound: 1 << 20,
			},
			want: false,
		},
		{
			// 11MiB > 10 MiB -> out of range from right
			objSize: 11 << 20,
			sizeFilter: BatchJobSizeFilter{
				UpperBound: 10 << 20,
				LowerBound: 1 << 20,
			},
			want: false,
		},
		{
			//  2MiB < 10MiB -> in range
			objSize: 2 << 20,

                            <la:message key="labels.dict_stopwords_title"/>
                        </h1>
                    </div>
                    <div class="col-sm-6">
                        <ol class="breadcrumb float-sm-right">
                            <li class="breadcrumb-item"><la:link href="/admin/dict">
                                <la:message key="labels.dict_list_link"/>
                            </la:link></li>

                            <la:message key="labels.dict_mapping_title"/>
                        </h1>
                    </div>
                    <div class="col-sm-6">
                        <ol class="breadcrumb float-sm-right">
                            <li class="breadcrumb-item"><la:link href="/admin/dict">
                                <la:message key="labels.dict_list_link"/>
                            </la:link></li>