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Added support for HTTP caching in the https example

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This commit is contained in:
Sébastien Huss 2016-12-20 22:02:52 +01:00
commit 9492b942b9
1 changed files with 26 additions and 3 deletions
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27
https_examples.cpp
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@ -1,5 +1,6 @@
#include "server_https.hpp"
#include "client_https.hpp"
#include "crypto.hpp"
//Added for the json-example
#define BOOST_SPIRIT_THREADSAFE
@ -22,7 +23,7 @@ typedef SimpleWeb::Client<SimpleWeb::HTTPS> HttpsClient;
//Added for the default_resource example
void default_resource_send(const HttpsServer &server, const shared_ptr<HttpsServer::Response> &response,
const shared_ptr<ifstream> &ifs);
std::string build_hash(const std::string full_file_name);
int main() {
//HTTPS-server at port 8080 using 1 thread
//Unless you do more heavy non-threaded processing in the resources,
@ -117,6 +118,16 @@ int main() {
if(!(boost::filesystem::exists(path) && boost::filesystem::is_regular_file(path)))
throw invalid_argument("file does not exist");
//Support for HTTP Cache
std::string hash = build_hash(path.string());
auto it=request->header.find("If-None-Match");
if(it!=request->header.end()) {
if (it->second == "\""+hash+"\"") {
*response << "HTTP/1.1 304 Not Modified\r\nCache-Control: max-age=86400\r\nETag: \""+hash+"\"\r\n\r\n";
return;
}
}
auto ifs=make_shared<ifstream>();
ifs->open(path.string(), ifstream::in | ios::binary);
@ -126,7 +137,7 @@ int main() {
ifs->seekg(0, ios::beg);
*response << "HTTP/1.1 200 OK\r\nContent-Length: " << length << "\r\n\r\n";
*response << "HTTP/1.1 200 OK\r\nCache-Control: max-age=86400\r\nETag: \""+hash+"\"\r\nContent-Length: " << length << "\r\n\r\n";
default_resource_send(server, response, ifs);
}
else
@ -181,3 +192,15 @@ void default_resource_send(const HttpsServer &server, const shared_ptr<HttpsServ
}
}
}
std::string build_hash(const std::string full_file_name) {
std::string ret = "";
std::ifstream file(full_file_name, std::ios::binary | std::ios::ate);
std::streamsize size = file.tellg();
file.seekg(0, std::ios::beg);
std::vector<char> buffer(size);
if (!file.read(buffer.data(), size))
return ret;
ret = reinterpret_cast<char*> (&buffer[0]);
return SimpleWeb::Crypto::md5(ret,1);
}