46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package utils
|
|
|
|
import (
|
|
"net/http"
|
|
"strconv"
|
|
"time"
|
|
)
|
|
|
|
func SetNeverCacheHeader(header http.Header) {
|
|
header.Set("Cache-Control", "max-age=0, no-cache, no-store, must-revalidate")
|
|
header.Set("Pragma", "no-cache")
|
|
}
|
|
|
|
func SetLastModifiedHeader(header http.Header, modTime time.Time) {
|
|
if !modTime.IsZero() {
|
|
header.Set("Last-Modified", modTime.UTC().Format(http.TimeFormat))
|
|
}
|
|
}
|
|
|
|
func SetCacheHeaderWithAge(header http.Header, maxAge uint, modifiedTime time.Time) {
|
|
header.Set("Cache-Control", "max-age="+strconv.Itoa(int(maxAge))+", must-revalidate")
|
|
if maxAge > 0 {
|
|
checkerSecondsBetween := int64(time.Now().UTC().Sub(modifiedTime.UTC()).Seconds())
|
|
if checkerSecondsBetween < 0 {
|
|
checkerSecondsBetween *= -1
|
|
}
|
|
header.Set("Age", strconv.FormatUint(uint64(checkerSecondsBetween)%uint64(maxAge), 10))
|
|
}
|
|
}
|
|
|
|
func SwitchToNonCachingHeaders(header http.Header) {
|
|
SetNeverCacheHeader(header)
|
|
if header.Get("Last-Modified") != "" {
|
|
header.Del("Last-Modified")
|
|
}
|
|
if header.Get("Age") != "" {
|
|
header.Del("Age")
|
|
}
|
|
if header.Get("Expires") != "" {
|
|
header.Del("Expires")
|
|
}
|
|
if header.Get("ETag") != "" {
|
|
header.Del("ETag")
|
|
}
|
|
}
|