v1: Fix ResponseData.Write behavior to match net/http.ResponseWriter.Write. #1326
From documentation of net/http.ResponseWriter.Write If WriteHeader has not yet been called, Write calls WriteHeader(http.StatusOK) before writing the data. Without this fix, ResponseData which went through middleware which depends on documented behavior of net/http.ResponseWriter.Write, basically which doesn't call net/http.ResponseWriter.WriteHeader explicitly, ended in non Written state. This leads into situation that NotFound handler will write into ResponseData although middleware did the write already.
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