And you want to have a way for the frontend to authenticate with the backend, using a **username** and **password**.

We can use **OAuth2** to build that with **FastAPI**.

But let's save you the time of reading the full long specification just to find those little pieces of information you need.

Let's use the tools provided by **FastAPI** to handle security.

## How it looks

            result.setCreatedTime(DfTypeUtil.toLong(source.get("createdTime")));
            result.setPermissions(toStringArray(source.get("permissions")));
            result.setReading(DfTypeUtil.toString(source.get("reading")));
            result.setSuggestWord(DfTypeUtil.toString(source.get("suggestWord")));
            result.setUpdatedBy(DfTypeUtil.toString(source.get("updatedBy")));

		// Offset should always be aligned to b.shardSize
		// Can never happen unless there are programmer bugs
		return 0, errUnexpected
	}
	if b.rc == nil {
		// For the first ReadAt() call we need to open the stream for reading.
		b.currOffset = offset
		streamOffset := (offset/b.shardSize)*int64(b.h.Size()) + offset
		if len(b.data) == 0 && b.tillOffset != streamOffset {

        if (isClient) {
          "Server-sent frames must not be masked."
        } else {
          "Client-sent frames must be masked."
        },
      )
    }

    // Get frame length, optionally reading from follow-up bytes if indicated by special values.
    frameLength = (b1 and B1_MASK_LENGTH).toLong()
    if (frameLength == PAYLOAD_SHORT.toLong()) {

     * 
     * @return output stream, needs to be closed when finished
     * @throws CIFSException
     */
    OutputStream openOutputStream () throws CIFSException;


    /**
     * Opens an input stream reading the file (read only)
     * 
     * @param flags
     *            open flags
     * @param access
     *            desired access flags
     * @param sharing

    /*
     * We overload this because we want readAndXWireFormat to
     * read the parameter words and bytes. This is so when
     * commands are batched together we can recursivly call
     * readAndXWireFormat without reading the non-existent header.
     */

    int decode( byte[] buffer, int bufferIndex ) {
        int start = headerStart = bufferIndex;

        bufferIndex += readHeaderWireFormat( buffer, bufferIndex );

labels.labelTypeIds=Надписи
labels.lang=язык
labels.outputs=Цель
labels.pos=POS
labels.purgeJobLogDay=Предварительная очистка журнала работы
labels.purgeUserInfoDay=Предварительная очистка пользователя
labels.reading=Чтение
labels.roleTypeIds=ID роль
labels.scriptData=Скрипт
labels.scriptResult=Результат
labels.scriptType=Исполнитель
labels.segmentation=Сегментация
labels.startTime=Время начала
labels.target=Цель

	}
	r := new(ReadCloser)
	if err = r.init(f, fi.Size()); err != nil && err != ErrInsecurePath {
		f.Close()
		return nil, err
	}
	r.f = f
	return r, err
}

// NewReader returns a new [Reader] reading from r, which is assumed to
// have the given size in bytes.
//
// If any file inside the archive uses a non-local name
// (as defined by [filepath.IsLocal]) or a name containing backslashes

### Asynchronous Get ([.kt][AsynchronousGetKotlin], [.java][AsynchronousGetJava])

Download a file on a worker thread, and get called back when the response is readable. The callback is made after the response headers are ready. Reading the response body may still block. OkHttp doesn't currently offer asynchronous APIs to receive a response body in parts.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

    checkNotNull(file);
    checkNotNull(charset);
    return new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), charset));
  }

  /**
   * Returns a new {@link ByteSource} for reading bytes from the given file.
   *
   * @since 14.0
   */
  public static ByteSource asByteSource(File file) {
    return new FileByteSource(file);
  }

  private static final class FileByteSource extends