32 lines
854 B
Go
32 lines
854 B
Go
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package main
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import (
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"net/http"
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)
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// Custom ResponseWriter to track Content-Type
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type customResponseWriter struct {
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http.ResponseWriter
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contentType string
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wroteHeader bool
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}
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func (crw *customResponseWriter) WriteHeader(code int) {
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crw.wroteHeader = true
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crw.ResponseWriter.WriteHeader(code)
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}
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func (crw *customResponseWriter) Header() http.Header {
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return crw.ResponseWriter.Header()
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}
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func (crw *customResponseWriter) Write(b []byte) (int, error) {
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if !crw.wroteHeader {
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if crw.contentType == "" {
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crw.contentType = http.DetectContentType(b)
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crw.ResponseWriter.Header().Set("Content-Type", crw.contentType)
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}
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crw.WriteHeader(http.StatusOK)
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}
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return crw.ResponseWriter.Write(b)
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}
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