r-bottom:1px solid #dee2e6;z-index:1034}.main-header .nav-link{height:2.5rem;position:relative}.main-header.text-sm .nav-link,.text-sm .main-header .nav-link{height:1.93725rem;padding:.35rem 1rem}.main-header.text-sm .nav-link>.fa,.main-header.text-sm .nav-link>.fab,.main-header.text-sm .nav-link>.fad,.main-header.text-sm .nav-link>.fal,.main-header.text-sm .nav-link>.far,.main-header.text-sm .nav-link>.fas,.main-header.text-sm .nav-link>.ion,.main-header.text-sm .nav-link>.svg-inline--fa,.text-sm...

.main-header .nav-link > .svg-inline--fa,\n.text-sm .main-header .nav-link > .ion, .main-header.text-sm .nav-link > .fa,\n.main-header.text-sm .nav-link > .fas,\n.main-header.text-sm .nav-link > .far,\n.main-header.text-sm .nav-link > .fab,\n.main-header.text-sm .nav-link > .fal,\n.main-header.text-sm .nav-link > .fad,\n.main-header.text-sm .nav-link > .svg-inline--fa,\n.main-header.text-sm .nav-link > .ion {\n  font-size: 0.875rem;\n}\n\n.main-header .navbar-nav .nav-item {\n  margin: 0;\n}\n\n.main-header...

.navbar-brand:hover{color:rgba(0,0,0,.9)}.navbar-light .navbar-nav .nav-link{color:rgba(0,0,0,.5)}.navbar-light .navbar-nav .nav-link:focus,.navbar-light .navbar-nav .nav-link:hover{color:rgba(0,0,0,.7)}.navbar-light .navbar-nav .nav-link.disabled{color:rgba(0,0,0,.3)}.navbar-light .navbar-nav .active>.nav-link,.navbar-light .navbar-nav .nav-link.active,.navbar-light .navbar-nav .nav-link.show,.navbar-light .navbar-nav .show>.nav-link{color:rgba(0,0,0,.9)}.navbar-light .navbar-toggler{color:rgba(0,0,...

.btn-outline-#{$color} {\n    @include button-outline-variant($value);\n  }\n}\n\n\n//\n// Link buttons\n//\n\n// Make a button look and behave like a link\n.btn-link {\n  font-weight: $font-weight-normal;\n  color: $link-color;\n  text-decoration: $link-decoration;\n\n  @include hover() {\n    color: $link-hover-color;\n    text-decoration: $link-hover-decoration;\n  }\n\n  &:focus,\n  &.focus {\n    text-decoration: $link-hover-decoration;\n  }\n\n  &:disabled,\n  &.disabled {\n    color: $btn-link-disabled-color;\n...

   */
  public abstract Writer openStream() throws IOException;

  /**
   * Opens a new buffered {@link Writer} for writing to this sink. The returned stream is not
   * required to be a {@link BufferedWriter} in order to allow implementations to simply delegate to
   * {@link #openStream()} when the stream returned by that method does not benefit from additional

  protected ByteSink() {}

  /**
   * Returns a {@link CharSink} view of this {@code ByteSink} that writes characters to this sink as
   * bytes encoded with the given {@link Charset charset}.
   */
  public CharSink asCharSink(Charset charset) {
    return new AsCharSink(charset);
  }

  /**
   * Opens a new {@link OutputStream} for writing to this sink. This method returns a new,
   * independent stream each time it is called.

   * {@code Ping-From}</a> header field name.
   *
   * @since 19.0
   */
  public static final String PING_FROM = "Ping-From";
  /**
   * The HTTP <a href="http://html.spec.whatwg.org/multipage/semantics.html#hyperlink-auditing">
   * {@code Ping-To}</a> header field name.
   *
   * @since 19.0
   */
  public static final String PING_TO = "Ping-To";

  /**
   * The HTTP <a

   *
   * <ul>
   *   <li>use {@link StringReader} instead of {@link CharSequenceReader}. It is faster since it can
   *       use {@link String#getChars(int, int, char[], int)} instead of copying characters one by
   *       one with {@link CharSequence#charAt(int)}.
   *   <li>use {@link Appendable#append(CharSequence)} in {@link #copyTo(Appendable)} and {@link

You can create production applications with **FastAPI** right now (and you have probably been doing it for some time), you just have to make sure that you use a version that works correctly with the rest of your code.

## Pin your `fastapi` version

Starlette (and **FastAPI**) are based on <a href="https://anyio.readthedocs.io/en/stable/" class="external-link" target="_blank">AnyIO</a>, which makes it compatible with both Python's standard library <a href="https://docs.python.org/3/library/asyncio-task.html" class="external-link" target="_blank">asyncio</a> and <a href="https://trio.readthedocs.io/en/stable/" class="external-link" target="_blank">Trio</a>.