go-wasm-http-server
go-wasm-http-server copied to clipboard
nlepage
"res.(http.Flusher).Flush()" not work
when use golang direct run,it's perfect: https://user-images.githubusercontent.com/342509/128476357-3f6f97de-7f09-4b16-97b7-39571450390c.mov
package main
import (
"fmt"
"net/http"
"time"
)
func main() {
http.HandleFunc("/wawawa", func(res http.ResponseWriter, req *http.Request) {
flusher := res.(http.Flusher)
res.Header().Set("Content-Type", "text/html")
fmt.Fprintf(res, "<!doctype html>\n<html><head><title>test</title></head><body>")
for i := 1; i <= 50; i++ {
fmt.Fprintf(res, "<p>Chunk #%d</p>\n<script>console.log(new Date())</script>\n", i)
// perfect
flusher.Flush()
time.Sleep(500 * time.Millisecond)
}
fmt.Fprintf(res, "</body>\n</html>")
})
http.ListenAndServe(":8080", nil)
select {}
}
but with wasm, it's not work: https://user-images.githubusercontent.com/342509/128476360-f9d80484-c6e4-4bb8-805d-5fc4273727e2.mov
package main
import (
"fmt"
"net/http"
"time"
wasmhttp "github.com/nlepage/go-wasm-http-server"
)
func main() {
http.HandleFunc("/wawawa", func(res http.ResponseWriter, req *http.Request) {
flusher := res.(http.Flusher)
res.Header().Set("Content-Type", "text/html")
fmt.Fprintf(res, "<!doctype html>\n<html><head><title>test</title></head><body>")
for i := 1; i <= 50; i++ {
fmt.Fprintf(res, "<p>Chunk #%d</p>\n<script>console.log(new Date())</script>\n", i)
// not work, 25 s later
flusher.Flush()
time.Sleep(500 * time.Millisecond)
}
fmt.Fprintf(res, "</body>\n</html>")
})
wasmhttp.Serve(nil)
select {}
}
Hi @xiongsongsong Yes this is an expected behavior. go-wasm-http-server first records the entire response then sends it in one piece to the browser. So in your case the first 25 seconds are spent recording the response, then all the html content is sent in a whole chunk to the browser. For now this kind of response "streaming" isn't possible. There is a related issue #2, about using a ReadableStream for the response body, which should allow this kind of streaming. I'm going to try using ReadableStream, I'll keep you updated.
