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Bug: fasthttp client connect to Vite dev server on localhost, tcp4 127.0.0.1:5173: connect: connection refused #1730

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sixcolors opened this issue Mar 3, 2024 · 2 comments
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Bug: fasthttp client connect to Vite dev server on localhost, tcp4 127.0.0.1:5173: connect: connection refused #1730

sixcolors opened this issue Mar 3, 2024 · 2 comments

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@sixcolors
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sixcolors commented Mar 3, 2024 •
edited

Bug Description

When using fasthttp.Client to connect to a Vite/react dev server running on port http://localhost:5173 the connection is refused with the following output Error: The HTTP request failed with error dial tcp4 127.0.0.1:5173: connect: connection refused

How to Reproduce

Clone https://github.com/sixcolors/FiberReactTest

cd frontend
npm install --include=dev && npm run dev

Don't run the main.go from the project but instead run the following:

package main

import (
	"io"
	"log"
	"net/http"

	"github.com/valyala/fasthttp"
)

func main() {
	// test connection to http://localhost:5173
	resp, err := http.Get("http://localhost:5173")
	if err != nil {
		log.Fatalf("Error: The HTTP request failed with error %s", err)
	} else {
		defer resp.Body.Close()
		data, err := io.ReadAll(resp.Body)
		if err != nil {
			log.Fatalf("Error reading body: %v", err)
		}
		log.Printf("HTTP Response Status: %d %s", resp.StatusCode, http.StatusText(resp.StatusCode))
		log.Printf("Response Body: %s", string(data))
	}

	statusCode, body, err := fasthttp.Get(nil, "http://localhost:5173")
	if err != nil {
		log.Fatalf("Error: The HTTP request failed with error %s", err)
	} else {
		log.Printf("HTTP Response Status: %d", statusCode)
		log.Printf("Response Body: %s", body)
	}
}

Expected Behavior

net/http client and fasthttp client both work the same.

Actual result

HTTP Response Status: 200 OK
Response Body: <!doctype html>
...
Error: The HTTP request failed with error dial tcp4 127.0.0.1:5173: connect: connection refused

related to bug report in downstream gofiber/fiber#2890
@sixcolors
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sixcolors commented Mar 3, 2024 •
edited

Further info Vite dev server only responds at http://localhost:5173 not http://127.0.0.1:5173 using curl, Safari or Chrome. Consistent with net/http client.

@sixcolors sixcolors mentioned this issue Mar 3, 2024
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@erikdubbelboer
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This is because vite only listens on IPv6 and fasthttp doesn't try dialing IPv6 by default. If you change the code to this it works:

	client := fasthttp.Client{
		DialDualStack: true,
	}
	statusCode, body, err := client.Get(nil, "http://localhost:5173")

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@erikdubbelboer @sixcolors