Upgrade vcpkg & fix fiber exception

.gitignore

@@ -15,3 +15,4 @@ test_install
 builds
 build-linux
 vcpkg_installed
+.DS_Store

libraries/http_server/http_server/http_ctx.hh

@@ -816,7 +816,14 @@ template <typename F> auto make_http_processor(F handler) {
       ctx.flush_responses();
   }
 }
-catch (const std::runtime_error& e) {
+catch (fiber_exception&) {
+  // Used internally (e.g. idle timeout, EPOLLRDHUP) to unwind the fiber via
+  // boost::context's exception-forwarding protocol. Must propagate to the
+  // callcc entry point in tcp_server.hh, which returns the continuation
+  // carried by the exception. Swallowing it here leaves boost::context's
+  // bookkeeping inconsistent and later crashes with a forced_unwind.
+  throw;
+} catch (const std::runtime_error& e) {
   std::cerr << "Error: " << e.what() << std::endl;
   return;
 } catch (...) {

single_headers/lithium.hh

@@ -10415,7 +10415,14 @@ template <typename F> auto make_http_processor(F handler) {
       ctx.flush_responses();
   }
 }
-catch (const std::runtime_error& e) {
+catch (fiber_exception&) {
+  // Used internally (e.g. idle timeout, EPOLLRDHUP) to unwind the fiber via
+  // boost::context's exception-forwarding protocol. Must propagate to the
+  // callcc entry point in tcp_server.hh, which returns the continuation
+  // carried by the exception. Swallowing it here leaves boost::context's
+  // bookkeeping inconsistent and later crashes with a forced_unwind.
+  throw;
+} catch (const std::runtime_error& e) {
   std::cerr << "Error: " << e.what() << std::endl;
   return;
 } catch (...) {

single_headers/lithium_http_server.hh

@@ -7206,7 +7206,14 @@ template <typename F> auto make_http_processor(F handler) {
       ctx.flush_responses();
   }
 }
-catch (const std::runtime_error& e) {
+catch (fiber_exception&) {
+  // Used internally (e.g. idle timeout, EPOLLRDHUP) to unwind the fiber via
+  // boost::context's exception-forwarding protocol. Must propagate to the
+  // callcc entry point in tcp_server.hh, which returns the continuation
+  // carried by the exception. Swallowing it here leaves boost::context's
+  // bookkeeping inconsistent and later crashes with a forced_unwind.
+  throw;
+} catch (const std::runtime_error& e) {
   std::cerr << "Error: " << e.what() << std::endl;
   return;
 } catch (...) {