I have a CPPCMS (V1.1.0) server (sample code below) and a C# (.NET 4.0) client (sample code below) and I'm trying to POST a file from the C# client to the CPPCMS server.
The server works if I POST to it from PaleMoon or a CURL (V7.56.1) client (sample code below), so I don't think the problem is in the server code.
The client works if I POST from it to http://posttestserver.com, so I don't think the problem is in the client code.
However, when I try my "working" CPPCMS server against my "working" C# client, I get a 400 Bad Request response. The response is generated by CPPCMS (my first server log is never written as application::main is not called), though CPPCMS does not show or throw any error on the server, even with debug logging enabled.
So I have a client and a server that both work on their own, but not together. Looking at the network trace in Microsoft Network Monitor 3.4 and TCPDUMP, I cannot see what's functionally different between a working request and a failing one. The trace suggests that CPPCMS fails on the very first packet of the POST (of a multi-packet POST request), though this may be a timing issue in the trace, I don't know.
Notes
- The CPPCMS server is running on Ubuntu 16.04
- The C# client is running on Windows 7
- The working CURL test was done from the server machine
- The working PaleMoon test was done from the client machine
- I copied the code from Ubuntu into this post by hand, so I may have errors in their samples below
CPPCMS web-server : main.cpp
#include <cppcms/service.h>
#include <cppcms/applications_pool.h>
#include <cppcms/application.h>
#include <cppcms/http_request.h>
#include <iostream>
#include <string>
class Application : public cppcms::application
{ public:
Application
( cppcms::service & service
): cppcms::application(service)
{ }
virtual void main
( std::string url
){ std::cout
<< "Request for " << url << std::endl
<< " Uploaded file count "
<< request().files().size()
<< std::endl;
};
int main(int argc, char * * args)
{ cppcms::service service(argc, args);
service.applications_pool().mount
( cppcms::applications_factory<Application>()
);
service.run();
return 0;
}
// g++ -o test main.cpp -lcppcms -lbooster -std=c++11
// ./test -c config.js
CPPCMS web-server : config.js
{ "service":
{ "api": "http"
, "port": 8080
, "ip": "10.0.0.4"
}
, "http": { "script": "/" }
, "logging": { "level": "debug" }
}
C# client : main.cs
using System;
using System.Net.Http;
namespace CPPCMSTest
{ class Program
{ static void Main(string[] args)
{ using(var client = new HttpClient())
using(var content = new MultipartFormDataContent())
{ content.Add(new StringContent("test"), "name", "filename");
Console.WriteLine
( client
. PostAsync("http://10.0.0.4:8080", content)
. Result
. Content
. ReadAsStringAsync()
. Result
);
}
}
}
}
// Output is:
// <html>
// <body>
// <h1>400 Bad Request</h1>
// </body>
// </html>
//
// CPPCMS output is:
// 2018-01-19 12:34:56; cppcms_http, info: POST / (http_api.cpp:249)
//
// That is, CPPCMS doesn't show an error and doesn't reach the application::main
CURL client : main.cpp
#include <curl/curl.h>
#include <iostream>
int main(int argc, char * * args)
{ curl_global_init(CURL_GLOBAL_DEFAULT);
CURL * curl(curl_easy_init());
curl_mime * mime(curl_mime_init(curl));
curl_mime_filedata(curl_mime_addpart(mime), "main.cpp");
curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);
curl_easy_setopt(curl, CURLOPT_URL, "http://10.0.0.4:8080");
curl_easy_perform(curl);
curl_mime_free(mime);
long responseCode;
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &responseCode);
curl_easy_cleanup(curl);
std::cout << "Response code is " << responseCode << std::endl;
return 0;
}
// g++ -o test main.cpp -lcurl -std=c++11
// ./test
// Response code is 200
//
// CPPCMS output is:
// 2018-01-19 12:34:56; cppcms_http, info: POST / (http_api.cpp:249)
// Request for
// Uploaded file count 1
