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workaround a problem in Steam_HTTP::SetHTTPRequestHeaderValue() where some games set a cache-control policy which allows only reponses from previous requests

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a 2024-08-16 14:30:14 +03:00
parent d7fb8403d1
commit afee4c4a72
2 changed files with 15 additions and 8 deletions
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9
dll/dll/steam_http.h
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@ -30,12 +30,15 @@ struct Steam_Http_Request {
bool requires_valid_ssl = false;
constexpr const static char STEAM_DEFAULT_USER_AGENT[] = "Valve/Steam HTTP Client 1.0";
// GET or POST parameter value on the request
// check Steam_HTTP::SetHTTPRequestHeaderValue() and make sure to bypass the ones that should be reserved
std::map<std::string, std::string> headers{
{"User-Agent", STEAM_DEFAULT_USER_AGENT},
{ "User-Agent", STEAM_DEFAULT_USER_AGENT },
{ "Cache-Control", "max-age=0" },
{ "Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7" },
{ "Upgrade-Insecure-Requests", "1" },
};
// GET or POST parameter value on the request
// GET or POST parameter value of the request
std::map<std::string, std::string> get_or_post_params{};
std::string post_raw{};

14
dll/steam_http.cpp
View File

@ -38,7 +38,7 @@ Steam_Http_Request *Steam_HTTP::get_request(HTTPRequestHandle hRequest)
// or such.
HTTPRequestHandle Steam_HTTP::CreateHTTPRequest( EHTTPMethod eHTTPRequestMethod, const char *pchAbsoluteURL )
{
PRINT_DEBUG("%i %s", eHTTPRequestMethod, pchAbsoluteURL);
PRINT_DEBUG("%i '%s'", eHTTPRequestMethod, pchAbsoluteURL);
std::lock_guard<std::recursive_mutex> lock(global_mutex);
if (!pchAbsoluteURL) return INVALID_HTTPREQUEST_HANDLE;
@ -83,7 +83,7 @@ HTTPRequestHandle Steam_HTTP::CreateHTTPRequest( EHTTPMethod eHTTPRequestMethod,
// sending the request. This is just so the caller can easily keep track of which callbacks go with which request data.
bool Steam_HTTP::SetHTTPRequestContextValue( HTTPRequestHandle hRequest, uint64 ulContextValue )
{
PRINT_DEBUG_ENTRY();
PRINT_DEBUG("%llu", ulContextValue);
std::lock_guard<std::recursive_mutex> lock(global_mutex);
Steam_Http_Request *request = get_request(hRequest);
@ -122,15 +122,19 @@ bool Steam_HTTP::SetHTTPRequestHeaderValue( HTTPRequestHandle hRequest, const ch
std::lock_guard<std::recursive_mutex> lock(global_mutex);
if (!pchHeaderName || !pchHeaderValue) return false;
std::string headerName(pchHeaderName);
std::transform(headerName.begin(), headerName.end(), headerName.begin(), [](char c){ return (char)std::toupper(c); });
if (headerName == "USER-AGENT") return false;
if (common_helpers::str_cmp_insensitive(pchHeaderName, "User-Agent")) return false;
Steam_Http_Request *request = get_request(hRequest);
if (!request) {
return false;
}
// FIX: appid 1902490 adds the header "Cache-Control: only-if-cached, max-stale=2678400"
// which means a response is returned back only if it was already cached, otherwise the server has to send a 504 "Gateway Timeout"
// just bypass the known ones to be on the safe side
if (common_helpers::str_cmp_insensitive(pchHeaderName, "Cache-Control")) return true;
if (common_helpers::str_cmp_insensitive(pchHeaderName, "Accept")) return true;
request->headers[pchHeaderName] = pchHeaderValue;
return true;
}