This is not a limitation of **FastAPI**, it's part of the HTTP protocol.

///

## Recap { #recap }

            if (ntlm == null) {
                resp.setHeader("WWW-Authenticate", "NTLM");
                if (offerBasic) {
                    resp.addHeader("WWW-Authenticate", "Basic realm=\"" + realm + "\"");
                }
                resp.setHeader("Connection", "close");
                resp.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
                resp.flushBuffer();
                return;
            }

        final Trans2GetDfsReferralResponse resp = new Trans2GetDfsReferralResponse();
        ipc.send(new Trans2GetDfsReferral(path), resp);

        if (resp.numReferrals == 0) {
            return null;
        }
        if (rn == 0 || resp.numReferrals < rn) {
            rn = resp.numReferrals;
        }

        DfsReferral dr = new DfsReferral();

    void constructor_happyPath() {
        // Arrange
        Configuration cfg = Mockito.mock(Configuration.class);

        // Act
        Smb2LogoffResponse resp = new Smb2LogoffResponse(cfg);

        // Assert
        assertNotNull(resp, "Response instance should be created");
    }

    @Nested
    @DisplayName("writeBytesWireFormat")
    class WriteBytesWireFormat {

        @ParameterizedTest

        // Arrange
        TransWaitNamedPipeResponse resp = new TransWaitNamedPipeResponse();
        // Act & Assert - no exceptions should be thrown
        assertDoesNotThrow(() -> resp.writeSetupWireFormat(null, 0));
        assertDoesNotThrow(() -> resp.writeParametersWireFormat(null, 0));
        assertDoesNotThrow(() -> resp.writeDataWireFormat(null, 0));
        assertDoesNotThrow(() -> resp.readSetupWireFormat(null, 0, 0));

    client = TestClient(app)
    resp = client.get(
        "/query",
        params={
            "param": "123",
            "param2": "456",
        },
    )
    assert resp.status_code == 200
    assert resp.json() == {
        "param": "123",
        "param2": "456",
    }


def test_header_pass_extra_list():
    client = TestClient(app)

    resp = client.get(
        "/header",

            }

            if (!resp.isReceived()) {
                throw new CIFSException("Did not receive response");
            }

            if (resp.getErrorCode() == 0x10B) {
                this.handle.markClosed();
            }
            if (resp.getErrorCode() == 0x10C) {
                resp.getNotifyInformation().clear();
            }

            Trans2FindFirst2Response resp = inv.getArgument(1);
            setField(resp, jcifs.internal.smb1.trans.SmbComTransactionResponse.class, "results", new FileEntry[] { new FE("x") });
            setField(resp, Trans2FindFirst2Response.class, "sid", 7);
            setField(resp, jcifs.internal.smb1.trans.SmbComTransactionResponse.class, "status", 0);
            resp.received();
            return resp;
        });

            }
        } else {
            resp.setHeader("WWW-Authenticate", "NTLM");
        }
        resp.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        resp.setContentLength(0);
        resp.flushBuffer();
        return null;
    }

                } else {
                    // Send 401
                    resp.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
                    resp.setHeader("WWW-Authenticate", "NTLM");
                    resp.flushBuffer();
                }
            }

            @Override
            protected void doDirectory(HttpServletRequest req, HttpServletResponse resp, SmbFile dir) throws IOException {