vary

Manipulate HTTP Vary headers for polycpp.

polycpp::vary is a C++20 companion port of the npm vary package. It keeps the pure header-string append behavior and adapts Node response-object mutation to polycpp::http::Headers or explicit response-like C++ handles.

#include <polycpp/vary/vary.hpp>

auto header = polycpp::vary::append("Accept", "Origin");

Pure append helper

Append one field, a comma-separated field string, or an ordered field vector to an existing Vary header.

Polycpp HTTP integration

Mutate polycpp::http::Headers or a polycpp::http::ServerResponse- style object instead of inventing a local header abstraction.

Case preserving

Duplicate checks are case-insensitive while output preserves existing and newly appended field casing.

Star semantics

Vary: * and field * behave like upstream and dominate all other fields.

Getting started

include(FetchContent)
FetchContent_Declare(
    polycpp_vary
    GIT_REPOSITORY https://github.com/polycpp/vary.git
    GIT_TAG        master
)
FetchContent_MakeAvailable(polycpp_vary)
target_link_libraries(my_app PRIVATE polycpp::vary)

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