Add test for sendBodyChunked.
Use io.MultipleWriter to simplify send body function.
Use ReadSlice in parseHeader, also add test.
Disable multi-line header support to avoid copy header.
Use ReadSlice in sendBodyChunked.
Move misc script into script directory.
Add integration test script.
Add "/" for empty URI path in generated request.
Use ReadSlice reading initial request line.
Use ReadSlice in parseResponse.