How to build PlatformIO based project

1. Install PlatformIO Core
2. Download development platform with examples
3. Extract ZIP archive
4. Run these commands:

# Change directory to example
$ cd platform-espressif32/examples/espidf-arduino-blink

# Build project
$ pio run

# Upload firmware
$ pio run --target upload

# Build specific environment
$ pio run -e esp32dev

# Upload firmware for the specific environment
$ pio run -e esp32dev --target upload

# Clean build files
$ pio run --target clean

######################################################
# Anpassung in HTTPClient.h
######################################################

struct RequestArgument {
    String key;
    String value;

    // Perfect forwarding constructor for maximum efficiency
    RequestArgument(String& k, String& v) : key(std::move(k)), value(std::move(v)) {}
    RequestArgument(const String& k, const String& v) : key(k), value(v) {}
    RequestArgument() = default;
};