Method sendFrame

Libraries/Http/HttpWebSocket.cpp:1064–1085

        }
        else
        {
            SC_TRY_MSG(not fragmentedMessageInProgress, "HttpWebSocketFrameWriter expected continuation frame");
        }
    }

    const bool requiresMask = scHttpWebSocketRequiresOutgoingMask(endpointRole);
    SC_TRY_MSG(frame.masked == requiresMask, "HttpWebSocketFrameWriter invalid frame masking for endpoint role");

    const size_t encodedLength =
        2 + (frame.payloadLength < 126 ? 0 : (frame.payloadLength <= 0xFFFF ? 2 : 8)) + (frame.masked ? 4 : 0);
    SC_TRY_MSG(storage.sizeInBytes() >= encodedLength, "HttpWebSocketFrameWriter header buffer too small");

    currentFrame = frame;

    uint8_t* output = reinterpret_cast<uint8_t*>(storage.data());
    output[0]       = static_cast<uint8_t>((frame.fin ? 0x80 : 0) | static_cast<uint8_t>(frame.opcode));

    size_t headerOffset = 1;
    if (frame.payloadLength < 126)
    {
        output[headerOffset++] = static_cast<uint8_t>((frame.masked ? 0x80 : 0) | frame.payloadLength);
    }
    else if (frame.payloadLength <= 0xFFFF)
    {
        output[headerOffset++] = static_cast<uint8_t>((frame.masked ? 0x80 : 0) | 126);