我在c ++中使用nginx实现fastCGI。到现在为止，我能够开发基本的http请求方法和一些url重定向。但是，在从post url重定向到另一个post url时，我无法发送消息正文。以下是我的代码：
#include <stdlib.h>
#include <stdio.h>
#include <sstream>
#include <iostream>
#include <string>
#include "string.h"
#include "fcgio.h"
#include <fcgi_stdio.h>
#include <boost/algorithm/string.hpp>
using namespace std;
using namespace boost;
// Maximum bytes
const unsigned long STDIN_MAX = 1000000;
/**
* Note this is not thread safe due to the static allocation of the
* content_buffer.
*/
string get_request_content(const FCGX_Request & request) {
char * content_length_str = FCGX_GetParam("CONTENT_LENGTH", request.envp);
unsigned long content_length = STDIN_MAX;
if (content_length_str) {
content_length = strtol(content_length_str, &content_length_str, 10);
if (*content_length_str) {
cerr << "Can't Parse 'CONTENT_LENGTH='"
<< FCGX_GetParam("CONTENT_LENGTH", request.envp)
<< "'. Consuming stdin up to " << STDIN_MAX << endl;
}
if (content_length > STDIN_MAX) {
content_length = STDIN_MAX;
}
} else {
// Do not read from stdin if CONTENT_LENGTH is missing
content_length = 0;
}
char * content_buffer = new char[content_length];
cin.read(content_buffer, content_length);
content_length = cin.gcount();
// Chew up any remaining stdin - this shouldn't be necessary
// but is because mod_fastcgi doesn't handle it correctly.
// ignore() doesn't set the eof bit in some versions of glibc++
// so use gcount() instead of eof()...
do cin.ignore(1024); while (cin.gcount() == 1024);
string content(content_buffer, content_length);
delete [] content_buffer;
return content;
}
int main(void) {
// Backup the stdio streambufs
streambuf * cin_streambuf = cin.rdbuf();
streambuf * cout_streambuf = cout.rdbuf();
streambuf * cerr_streambuf = cerr.rdbuf();
FCGX_Request request;
FCGX_Init();
FCGX_InitRequest(&request, 0, 0);
while (FCGX_Accept_r(&request) == 0) {
fcgi_streambuf cin_fcgi_streambuf(request.in);
fcgi_streambuf cout_fcgi_streambuf(request.out);
fcgi_streambuf cerr_fcgi_streambuf(request.err);
cin.rdbuf(&cin_fcgi_streambuf);
cout.rdbuf(&cout_fcgi_streambuf);
cerr.rdbuf(&cerr_fcgi_streambuf);
const char * uri = FCGX_GetParam("REQUEST_URI", request.envp);
string content = get_request_content(request);
if (content.length() == 0) {
content = ", something!";
}
const char * mediaType = FCGX_GetParam("REQUEST_METHOD",request.envp);
string value;
if(iequals(mediaType,"POST")&&iequals(uri,"/postmethod")) {
get_request_content(request);
cout << "HTTP/1.1 200 OK\r\nContent-Length: " << content.length() << "\r\n\r\n" << content;
}
if(iequals(mediaType,"GET")&&iequals(uri,"/getmethod")) {
string aalu = "this is the new lenght";
cout << "HTTP/1.1 200 OK\r\nContent-Length: " << aalu.length() << "\r\n\r\n" << aalu;
FCGX_Finish_r(&request);
}
if(iequals(mediaType,"GET")&&iequals(uri,"/redirect")) {
cout << "HTTP/1.1 301\r\nLocation: http://localhost/getmethod\r\n\r\n";
// cout << "Status: 301\r\n"
// << "Location: http://localhost/getmethod\r\n";
// << "\r\n";
// << "<html><body>Not Found</body></html>\n";
}
if(iequals(mediaType,"GET")&&iequals(uri,"/postredirect")) { // problem here
string json = "{\"topic\":\"asdf\",\"message\":\"message\"}";
cout << "HTTP/1.1 308\r\nLocation: http://localhost/postmethod\r\n\r\n";
// cout << "Status: 304\r\n"
// << "Location: http://localhost/postmethod\r\n"
// << "\r\n"
// << "<html><body>json</body></html>\n";
}
if(iequals(mediaType,"POST")&&iequals(uri,"/getredirect")) {
string json = "{\"topic\":\"asdf\",\"message\":\"message\"}";
cout << "HTTP/1.1 303\r\nLocation: http://localhost/getmethod\r\n\r\n";
// cout << "Status: 304\r\n"
// << "Location: http://localhost/postmethod\r\n"
// << "\r\n"
// << "<html><body>json</body></html>\n";
}
if(iequals(mediaType,"POST")&&iequals(uri,"/posttopostredirect")) {
string json = "{\"topic\":\"adf\",\"message\":\"message\"}";
cout << "Status: 307\r\n"
<<"Location: http://localhost/postmethod\r\n"
<<"\r\n"
<<"\n";
// cout << "Status: 305\r\n"
// << "Location: http://localhost/postmethod\r\n"
// << "\r\n"
// << "<html><body>"+json+"</body></html>\n";
}
if(iequals(mediaType,"GET")&&iequals(uri,"/getttogettredirect")) {
string json = "{\"topic\":\"ssdf\",\"message\":\"message\"}";
cout << "HTTP/1.X 301\r\nLocation: http://localhost/getmethod\r\n\r\n";
// cout << "Status: 307\r\n"
// << "Location: http://localhost/postmethod\r\n"
// << "\r\n";
// << "<html><body>json</body></html>\n";
}
}
// restore stdio streambufs
cin.rdbuf(cin_streambuf);
cout.rdbuf(cout_streambuf);
cerr.rdbuf(cerr_streambuf);
return 0;
}
/ posttopostredirect url重定向到/ postmethod url。在这里，我希望在/ posttopostredirect被命中/ postmethod url时发送json字符串（上面）。但无法弄清楚如何做到这一点
答案 0 :(得分：0)
完全忽略HTTP重定向消息的任何内容。这与FastCGI无关。这就是HTTP的工作原理。 HTTP重定向消息不能用于发送任何内容。好吧，他们可以，但HTTP客户端会忽略它，并向重定向到的URL发出GET请求。
唯一可以做的是将任何数据包含在重定向到的URL中编码的参数中。这与编码URL中的任何参数的方式相同。