// appropriate length.
func formatPAXRecord(k, v string) (string, error) {
	if !validPAXRecord(k, v) {
		return "", ErrHeader
	}

	const padding = 3 // Extra padding for ' ', '=', and '\n'
	size := len(k) + len(v) + padding
	size += len(strconv.Itoa(size))
	record := strconv.Itoa(size) + " " + k + "=" + v + "\n"

        if (hasSkip) {
          return null; // Can't have more than one ::
        }
        hasSkip = true;
        partsSkipped++; // :: means we skipped an extra part in between the two delimiters.
        if (i == 0) {
          partsSkipped++; // Begins with ::, so we skipped the part preceding the first :
        }
        if (i == ipString.length() - 2) {

            String path = "\\\\server\\share";
            buffer = new DfsReferralRequestBuffer(path, 3);

            int offset = 1000;
            byte[] dst = new byte[offset + buffer.size() + 100]; // Extra space

            int bytesEncoded = buffer.encode(dst, offset);

            assertEquals(buffer.size(), bytesEncoded);

            // Verify data is at correct offset

	errCode = checkMetaHeaders(signedHeadersMap, r)
	if errCode != ErrUnsignedHeaders {
		t.Fatalf("Expected the APIErrorCode to be %d, but got %d", ErrUnsignedHeaders, errCode)
	}

	// Delete extra metadata from header to don't affect other test
	inputHeader.Del("X-Amz-Meta-Clone")
	// calling the function being tested.
	errCode = checkMetaHeaders(signedHeadersMap, r)
	if errCode != ErrNone {

///

{* ../../docs_src/security/tutorial005_an_py310.py hl[5,141,172] *}

/// info | Technical Details

`Security` is actually a subclass of `Depends`, and it has just one extra parameter that we'll see later.

But by using `Security` instead of `Depends`, **FastAPI** will know that it can declare security scopes, use them internally, and document the API with OpenAPI.

            assertEquals(32768, response.getChunkBytesWritten());
            assertEquals(1638400, response.getTotalBytesWritten());
        }

        @Test
        @DisplayName("Should handle buffer with extra data")
        void testBufferWithExtraData() throws SMBProtocolDecodingException {
            byte[] buffer = new byte[100];
            // Write valid response data
            SMBUtil.writeInt4(15, buffer, 0);

     * @throws SmbException
     */
    synchronized SmbFileHandleImpl ensureOpen() throws CIFSException {
        // ensure file is open
        if (this.handle == null || !this.handle.isValid()) {
            // one extra acquire to keep this open till the stream is released
            this.handle =
                    this.file.openUnshared(this.openFlags, this.access, this.sharing, SmbConstants.ATTR_NORMAL, this.options).acquire();

///

{* ../../docs_src/security/tutorial005_an_py310.py hl[5,140,171] *}

/// info | Informações Técnicas

`Security` é na verdade uma subclasse de `Depends`, e ele possui apenas um parâmetro extra que veremos depois.

Porém ao utilizar `Security` no lugar de `Depends`, o **FastAPI** saberá que ele pode declarar escopos de segurança, utilizá-los internamente, e documentar a API com o OpenAPI.

			s.buf = newBuf
			s.end -= s.start
			s.start = 0
		}
		// Finally we can read some input. Make sure we don't get stuck with
		// a misbehaving Reader. Officially we don't need to do this, but let's
		// be extra careful: Scanner is for safe, simple jobs.
		for loop := 0; ; {
			n, err := s.r.Read(s.buf[s.end:len(s.buf)])
			if n < 0 || len(s.buf)-s.end < n {
				s.setErr(ErrBadReadCount)
				break
			}
			s.end += n

Mas queremos ser mais inteligentes e simplificar um pouco o código.

Sabemos que todas as *operações de rota* neste módulo têm o mesmo:

* Path `prefix`: `/items`.
* `tags`: (apenas uma tag: `items`).
* Extra `responses`.
* `dependências`: todas elas precisam da dependência `X-Token` que criamos.

Então, em vez de adicionar tudo isso a cada *operação de rota*, podemos adicioná-lo ao `APIRouter`.