cache http requests on file system in go

main.go
package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
    "os"
)

func main() {
    url := "https://www.example.com"

    // Check if the cached response is available on the file system
    cachePath := "/tmp/cache/example.html"
    if _, err := os.Stat(cachePath); err == nil {
        // Cached response is available, return it
        data, err := ioutil.ReadFile(cachePath)
        if err != nil {
            fmt.Println("Error reading cached file: ", err)
        } else {
            fmt.Println("Returning cached response")
            fmt.Println(string(data))
            return
        }
    }

    // Cached response is not available, fetch the response from the web server
    fmt.Println("Fetching response from server")
    resp, err := http.Get(url)
    if err != nil {
        fmt.Println("Error fetching response: ", err)
        return
    }
    defer resp.Body.Close()

    // Read the response body
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Println("Error reading response body: ", err)
        return
    }

    // Write the response body to the cache
    err = ioutil.WriteFile(cachePath, body, 0644)
    if err != nil {
        fmt.Println("Error writing to cache: ", err)
    }

    fmt.Println("Returning response from server")
    fmt.Println(string(body))
}
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