* `headers` - A `dict` of strings.
* `media_type` - A `str` giving the media type. E.g. `"text/html"`.

FastAPI (actually Starlette) will automatically include a Content-Length header. It will also include a Content-Type header, based on the `media_type` and appending a charset for text types.

{* ../../docs_src/response_directly/tutorial002.py hl[1,18] *}

### `HTMLResponse` { #htmlresponse }

* `headers` - Un `dict` de strings.
* `media_type` - Un `str` que da el media type. Por ejemplo, `"text/html"`.

FastAPI (de hecho Starlette) incluirá automáticamente un header Content-Length. También incluirá un header Content-Type, basado en el `media_type` y añadiendo un conjunto de caracteres para tipos de texto.

{* ../../docs_src/response_directly/tutorial002.py hl[1,18] *}

### `HTMLResponse`

Но внутреннее устройство **конкурентности** и **параллелизма** довольно разное.

Чтобы это понять, представьте такую картину:

### Конкурентные бургеры

<!-- The gender neutral cook emoji "🧑‍🍳" does not render well in browsers. In the meantime, I'm using a mix of male "👨‍🍳" and female "👩‍🍳" cooks. -->

        try {
            /*
             * We cannot synchronize (run_thread) here or the caller's
             * thread.wait( timeout ) cannot reaquire the lock and
             * return which would render the timeout effectively useless.
             */
            if (this.state != 5 && this.state != 6) {
                doConnect();
            }
        } catch (final Exception ex) {

/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License

            this.updateCalendars();

            //update the form inputs above the calendars with the new time
            this.updateFormInputs();

            //re-render the time pickers because changing one selection can affect what's enabled in another
            this.renderTimePicker('left');
            this.renderTimePicker('right');

        },

    protected void writeNoCache(final StreamResponse response, final ResponseData responseData) {
        response.header("Pragma", "no-cache");
        response.header("Cache-Control", "no-cache");
        response.header("Expires", "Thu, 01 Dec 1994 16:00:00 GMT");
    }

    /**
     * Writes content disposition header with filename.
     *
     * @param response the stream response
     * @param responseData the response data

	defer zipWriter.Close()
	rawDataFn := func(r io.Reader, filename string, sz int) error {
		header, zerr := zip.FileInfoHeader(dummyFileInfo{
			name:    filename,
			size:    int64(sz),
			mode:    0o600,
			modTime: time.Now(),
			isDir:   false,
			sys:     nil,
		})
		if zerr != nil {
			adminLogIf(ctx, zerr)
			return nil
		}
		header.Method = zip.Deflate

	"strconv"
	"strings"
	"time"
)

// Reader provides sequential access to the contents of a tar archive.
// Reader.Next advances to the next file in the archive (including the first),
// and then Reader can be treated as an io.Reader to access the file's data.
type Reader struct {
	r    io.Reader
	pad  int64      // Amount of padding (ignored) after current file entry
	curr fileReader // Reader for current file entry

import (
	"errors"
	"io"
	"unicode/utf8"
)

// A Reader implements the [io.Reader], [io.ReaderAt], [io.WriterTo], [io.Seeker],
// [io.ByteScanner], and [io.RuneScanner] interfaces by reading from
// a byte slice.
// Unlike a [Buffer], a Reader is read-only and supports seeking.
// The zero value for Reader operates like a Reader of an empty slice.
type Reader struct {
	s        []byte
	i        int64 // current reading index