Write writes the data to the connection as part of an HTTP reply.

If WriteHeader has not yet been called, Write calls WriteHeader(http.StatusOK) before writing the data. If the Header does not contain a Content-Type line, Write adds a Content-Type set to the result of passing the initial 512 bytes of written data to DetectContentType.

Depending on the HTTP protocol version and the client, calling Write or WriteHeader may prevent future reads on the Request.Body. For HTTP/1.x requests, handlers should read any needed request body data before writing the response. Once the headers have been flushed (due to either an explicit Flusher.Flush call or writing enough data to trigger a flush), the request body may be unavailable. For HTTP/2 requests, the Go HTTP server permits handlers to continue to read the request body while concurrently writing the response. However, such behavior may not be supported by all HTTP/2 clients. Handlers should read before writing if possible to maximize compatibility.