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This is based on the C++11 version, and is related to Issue #15.
While the Arduino does not have the standard library, it has its own String version. The
F(...)
macro wrapping the C strings tells the microcontroller to store the data in flash instead of permanently using a massive portion of RAM.Similarly, due to how the system works, inlining
reasonPhrase
would cause the strings to be copied every time the function was called.Modern build tools like PlatformIO automatically detect, compile, and link the cpp file without any special handling needed.