Here is a list of all documented files with brief descriptions:

exports
drogon
exports.h
lib
inc
drogon
version.h
lib
inc
drogon
plugins
AccessLogger.h
GlobalFilters.h
Hodor.h
Plugin.h
PromExporter.h
RealIpResolver.h
Redirector.h
SecureSSLRedirector.h
SlashRemover.h
utils
coroutine.h
FunctionTraits.h
HttpConstraint.h
monitoring.h
OStringStream.h
Utilities.h
Attribute.h
CacheMap.h
Cookie.h
DrClassMap.h
DrObject.h
drogon.h
drogon_callbacks.h
drogon_test.h
DrTemplate.h
DrTemplateBase.h
HttpAppFramework.h
HttpBinder.h
HttpClient.h
HttpController.h
HttpFilter.h
HttpMiddleware.h
HttpRequest.h
HttpResponse.h
HttpSimpleController.h
HttpTypes.h
HttpViewData.h
IntranetIpFilter.h
IOThreadStorage.h
LocalHostFilter.h
MultiPart.h
NotFound.h
PubSubService.h
RateLimiter.h
RequestStream.h
Session.h
UploadFile.h
WebSocketClient.h
WebSocketConnection.h
WebSocketController.h
orm_lib
inc
drogon
orm
ArrayParser.h
BaseBuilder.h
CoroMapper.h
Criteria.h
DbClient.h
DbConfig.h
DbListener.h
DbTypes.h
Exception.h
Field.h
FunctionTraits.h
Mapper.h
RestfulController.h
Result.h
ResultIterator.h
Row.h
RowIterator.h
SqlBinder.h