Fix comparison of `X-Ouinet-Private` value.

The true value is case-insensitive.

src/client.cpp

@@ -14,6 +14,7 @@
 #include <boost/range/adaptor/filtered.hpp>
 #include <boost/range/adaptor/transformed.hpp>
 #include <boost/range/adaptor/indexed.hpp>
+#include <boost/regex.hpp>
 #include <iostream>
 #include <cstdlib>  // for atexit()
 
@@ -89,6 +90,9 @@ static const fs::path OUINET_CA_CERT_FILE = "ssl-ca-cert.pem";
 static const fs::path OUINET_CA_KEY_FILE = "ssl-ca-key.pem";
 static const fs::path OUINET_CA_DH_FILE = "ssl-ca-dh.pem";
 
+// Flags for normal, case-insensitive regular expression.
+static const auto rx_icase = boost::regex::normal | boost::regex::icase;
+
 static bool log_transactions() {
     return logger.get_threshold() <= DEBUG
         || logger.get_log_file() != nullptr;
@@ -1778,7 +1782,8 @@ void Client::State::serve_request( GenericStream&& con
         Match( reqexpr::from_regex(method_getter, "HEAD")
              , nocache_request_config),
 
-        Match( reqexpr::from_regex(x_private_getter, "True")
+        Match( reqexpr::from_regex( x_private_getter
+                                  , boost::regex(http_::request_private_true, rx_icase))
              , nocache_request_config),
 
         // Disable cache and always go to proxy for this site.

src/client.h

@@ -21,7 +21,7 @@ static const std::string request_group_hdr = header_prefix + "Group";
 // instructs the client to avoid request mechanisms that
 // would reveal the request or the associated response to other users.
 static const std::string request_private_hdr = header_prefix + "Private";
-static const std::string request_private_true = "true";
+static const std::string request_private_true = "true";  // case insensitive
 
 }