web服务器为Aapache(运行在linux上)扩展模块(参看这里),将收到来自客户端的POST请求文本写到某个目录中,客户端发送代码如下(不完整):
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strcpy
(szURL,
"http://www.xxx.com"
) // xxx 仅仅为了说明问题
if
(!::InternetCheckConnection(szURL, FLAG_ICC_FORCE_CONNECTION, 0))
return
FALSE;
TCHAR
szModuleFile[MAX_PATH] = {0};
::GetModuleFileName(NULL, szModuleFile, MAX_PATH);
LPCTSTR
lpPath = ::PathFindFileName(szModuleFile);
HINTERNET hOpen = ::InternetOpen(lpPath, INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY, NULL, NULL, 0);
if
(NULL == hOpen)
return
FALSE;
HINTERNET hConnect = ::InternetConnect(hOpen, lpDomain, dwPort, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);
if
(NULL == hConnect)
goto
FUN_END2;
LPCTSTR
szAccept[] = {_T(
"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
), NULL};
DWORD
dwFlag = INTERNET_FLAG_NO_CACHE_WRITE | INTERNET_FLAG_RELOAD | INTERNET_FLAG_KEEP_CONNECTION;
HINTERNET hOpenRequest = ::HttpOpenRequest(hConnect, _T(
"POST"
), _T(
"my_app"
),
_T(
"HTTP/1.1"
), szURL, szAccept, dwFlag, 0);
// my_app是apache扩展C++模块.
if
(NULL == hOpenRequest)
goto
FUN_END1;
BOOL
bRet = FALSE;
TCHAR
headerContentLength[64];
_stprintf(headerContentLength, _T(
"Content-Length: %d\r\n\r\n"
), nLen);
// 这个语句向http://www.xxx.com/my_app发送数据.
bRet = ::HttpSendRequest(hOpenRequest, headerContentLength, _tcslen(headerContentLength), utf8PostData, nLen);
DWORD
dwErr = ::GetLastError();
if
(!bRet)
goto
FUN_END1;
TCHAR
szBuff[BUF_LEN_1024] = {0};
DWORD
dwBuffSize = BUF_LEN_1024*
sizeof
(szBuff)-2;
bRet = ::HttpQueryInfo(hOpenRequest, HTTP_QUERY_STATUS_CODE, (
LPVOID
)szBuff, &dwBuffSize, NULL);
//Reference to http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
int
nStatusCode = _tstoi(szBuff);
//if (nStatusCode<200 || 206<nStatusCode)
if
(200 != nStatusCode)
bRet = FALSE;
......
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在调试过程中发现,HttpSendRequest总是返回FALSE,错误码为12152(MSDN定义,ERROR_HTTP_INVALID_SERVER_RESPONSE,The server response could not be parsed).经过抓包可知,网络正常,3次握手,4次分手都正常,说明apache确实收到了这份数据,通过浏览器访问http://www.xxx.com/my_app也正常.
有不少网友说该错误可能发生在客户端或者系统,例如杀毒软件,网络异常等等,现这里不是这种问题,经过调查发现,错误竟然出在服务端读写权限上.扩展模块my_app会将收到的数据写到目录log,但log的权限开始是"drwxr-xr-x.",后来修改了权限(chmod ugo+w log)为"drwxrwxrwx."竟然可以了.
从这个错误可以看出,当apache不能处理某个http请求时,不会将相应的数据传递给C++扩展模块,而是返回错误(12152)给发送程序.
本文转自jetyi51CTO博客，原文链接：http://blog.51cto.com/jetyi/1254778 ，如需转载请自行联系原作者
