THttpServer: force requests with URL beginning by "custom" to go to MissedRequest

ROOT
1

Hi,

On a THttpServer, I need to do a custom processing of some URL. This works since months already with MissedRequest.

I notice that when an URL ends by .json, it will not go through MissedRequest, but always be processed by the ROOT system.

Question: How to force URLs beginning by custom/ to always go through my function MissedRequest?

Example:

  • currently, http://127.0.0.1/custom/path/to/h.json is not found, but it does not go through MissedRequest
  • how to make http://127.0.0.1/custom/<anything> awalys go through MissedRequest even if <anything> contains h.json ?

Maybe @linev would you have an idea? Thank you again.

Have a good day.

PS:

Can I do something like this on THttpServer.cxx? :

/// In most cases information is provided by TRootSniffer class
 
void THttpServer::ProcessRequest(std::shared_ptr<THttpCallArg> arg)
{
    std::cout << "test\n\n";

    std::string uri = arg->fUri; 
    if (uri.rfind("/custom/", 0) == 0) { 
        return MissedRequest(arg); 
    }


    if (fTerminated) {
        arg->Set404();
        return;
    }

    ...

But then can I just include this modified/patched THttpServer.cxx in my project, without recompiling the whole ROOT?

I tried to add the patched THttpServer.cxx it in CMakeLists.txt:

cmake_minimum_required(VERSION 3.12)
set(CMAKE_CXX_STANDARD 20)
set(PROJECT_NAME test)
project(${PROJECT_NAME})
find_package(ROOT REQUIRED COMPONENTS RIO Net Hist Tree Gui RHTTP)
set(CMAKE_CXX_FLAGS "${ROOT_CXX_FLAGS}")
include_directories(${CMAKE_CURRENT_SOURCE_DIR})
add_executable(test main.cpp THttpServer.cxx)  <--- ** here added: THttpServer.cxx**
target_include_directories(test PRIVATE ${ROOT_INCLUDE_DIRS} ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(test PRIVATE ${ROOT_LIBRARIES} curl)

set(INSTALL_PATH_BIN ${CMAKE_INSTALL_PREFIX}/bin)
install(TARGETS test DESTINATION ${INSTALL_PATH_BIN})

but then I have other errors like

/home/test/src/THttpServer.cxx:27:10: fatal error: THttpLongPollEngine.h: No such file or directory
   27 | #include "THttpLongPollEngine.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~

Any idea on how to just include a patched THttpServer.cxx, without recompiling the whole ROOT project?

2

Solved! It seems to work simply by subclassing THttpServer and using:

class MyHttpServer : public THttpServer {
  public:
    MyHttpServer(const char *engine);
    ~MyHttpServer();
    void MissedRequest(THttpCallArg *arg) override;    
    void ProcessRequest(std::shared_ptr<THttpCallArg> arg) override {
        if (strncmp("custom", arg->GetPathName(), strlen("custom")) == 0) {
            MissedRequest(arg.get());
            return;
        }
        THttpServer::ProcessRequest(arg);
    }