httpchunked.C File Reference

Detailed Description

This macro shows implementation of chunked requests These are special kind of user-defined requests which let split large http reply on many chunks so that server do not need to allocate such memory at once.

After macro started, try to execute request with

wget http://localhost:8080/chunked.txt

CAUTION: Example is not able to handle multiple requests at the same time For this one should create counter for each THttpCallArg instance

 
#include "THttpServer.h"
#include "THttpCallArg.h"
#include <cstring>
 
class TChunkedHttpServer : public THttpServer {
   protected:
 
      int fCounter = 0;
 
      /** process only requests which are not handled by THttpServer itself */
      void MissedRequest(THttpCallArg *arg) override
      {
         if (strcmp(arg->GetFileName(), "chunked.txt"))
            return;
 
         arg->SetChunked();
 
         std::string content = "line" + std::to_string(fCounter++) + "   ";
 
         for (int n = 0; n < 2000; n++)
            content.append("-");
         content.append("\n");
 
         if (fCounter >= 1000) {
            // to stop chunk transfer either provide empty content or clear chunked flag
            fCounter = 0;
            arg->SetChunked(kFALSE);
         }
 
         arg->SetTextContent(std::move(content));
      }
 
   public:
      TChunkedHttpServer(const char *engine) : THttpServer(engine) {}
 
   ClassDefOverride(TChunkedHttpServer, 0)
};
 
void httpchunked()
{
   // start http server
   auto serv = new TChunkedHttpServer("http:8080");
 
   // reduce to minimum timeout for async requests processing
   serv->SetTimer(1);
}

Author

Sergey Linev

Definition in file httpchunked.C.