Getting errors with compression set to true

[QiMata]

The offending class is in ZLibServerFilter.h and the offending line is in the sendHeaders method:

void sendHeaders(HTTPMessage& msg) noexcept override {
    DCHECK(compressor_ == nullptr);
    DCHECK(header_ == false); //This is the offending line

    chunked_ = msg.getIsChunked();

    // Make final determination of whether to compress
    compress_ = isCompressibleContentType(msg) &&
      (chunked_ || isMinimumCompressibleSize(msg));

    // Add the gzip header
    if (compress_) {
      auto& headers = msg.getHeaders();
      headers.set(HTTP_HEADER_CONTENT_ENCODING, "gzip");
    }

    // If it's chunked or not being compressed then the headers can be sent
    // if it's compressed and one body, then need to calculate content length.
    if (chunked_ || !compress_) {
      Filter::sendHeaders(msg);
      header_ = true;
    } else {
      responseMessage_ = folly::make_unique<HTTPMessage>(msg);
    }
  }

This is the code for my onEOM method:

void whod::server::file_server::file_handler::onEOM() noexcept
{
    if (file_container_->contains(path_))
    {
        ResponseBuilder(downstream_)
                .status(200, "OK")
                .body(file_container_->get(path_))
                .sendWithEOM();
    }
    ResponseBuilder(downstream_)
            .status(404, "NOT FOUND")
            .body(file_container_->get("/404.html"))
            .sendWithEOM();
}

the stack trace:
F0308 09:19:55.967344 12264 ZlibServerFilter.h:39] Check failed: header_ == false
*** Check failure stack trace: ***
@ 0x7f097fd47daa (unknown)
@ 0x7f097fd47ce4 (unknown)
@ 0x7f097fd476e6 (unknown)
@ 0x7f097fd4a687 (unknown)
@ 0x7f09806d6709 proxygen::ZlibServerFilter::sendHeaders()
@ 0x44cd29 proxygen::ResponseBuilder::send()
@ 0x44cb62 proxygen::ResponseBuilder::sendWithEOM()
@ 0x44bca3 whod::server::file_server::file_handler::onEOM()
@ 0x7f0980718583 proxygen::HTTPTransaction::processIngressEOM()
@ 0x7f098071991d proxygen::HTTPTransaction::onIngressEOM()
@ 0x7f098070c26f proxygen::HTTPSession::onMessageComplete()
@ 0x7f098073c2e5 proxygen::HTTP1xCodec::onMessageComplete()
@ 0x7f098073d44a proxygen::HTTP1xCodec::onMessageCompleteCB()
@ 0x7f09806ffe80 proxygen::http_parser_execute()
@ 0x7f098073c919 proxygen::HTTP1xCodec::onIngress()
@ 0x7f0980704b67 proxygen::HTTPSession::processReadData()
@ 0x7f0980706645 proxygen::HTTPSession::readDataAvailable()
@ 0x7f0980145180 folly::AsyncSocket::handleRead()
@ 0x7f0980141edb folly::AsyncSocket::ioReady()
@ 0x7f097d7ccf24 (unknown)
@ 0x7f09801537ee folly::EventBase::loopBody()
@ 0x7f0980154a84 folly::EventBase::loopForever()
@ 0x7f0980787cef wangle::IOThreadPoolExecutor::threadRun()
@ 0x7f098079ad83 ZNKSt7_Mem_fnIMN6wangle18ThreadPoolExecutorEFvSt10shared_ptrINS1_6ThreadEEEEclIJRS4_EvEEvPS1_DpOT
@ 0x7f098079960d _ZNSt5_BindIFSt7_Mem_fnIMN6wangle18ThreadPoolExecutorEFvSt10shared_ptrINS2_6ThreadEEEEPS2_S5_EE6__callIvIEILm0ELm1EEEET_OSt5tupleIIDpT0_EESt12_Index_tupleIIXspT1_EEE
@ 0x7f0980796f88 std::_Bind<>::operator()<>()
@ 0x7f0980794d93 std::_Function_handler<>::_M_invoke()
@ 0x7f097f8c4a60 (unknown)
@ 0x7f097f3e7182 start_thread
@ 0x7f097f11438d (unknown)
@ (nil) (unknown)

[crackcomm]

I think it's because You send response twice, try with else:

void whod::server::file_server::file_handler::onEOM() noexcept {
    if (file_container_->contains(path_)) {
        ResponseBuilder(downstream_)
                .status(200, "OK")
                .body(file_container_->get(path_))
                .sendWithEOM();
    } else {
        ResponseBuilder(downstream_)
                .status(404, "NOT FOUND")
                .body(file_container_->get("/404.html"))
                .sendWithEOM();
    }
}

[QiMata]

You are right, and I feel dumb. Thank you!