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response.go
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response.go
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package goproxy
import (
"context"
"errors"
"fmt"
"net/http"
"net/url"
"strings"
)
// setResponseCacheControlHeader sets the Cache-Control header based on the
// maxAge.
func setResponseCacheControlHeader(rw http.ResponseWriter, maxAge int) {
cacheControl := ""
if maxAge >= 0 {
cacheControl = fmt.Sprintf("public, max-age=%d", maxAge)
} else {
cacheControl = "must-revalidate, no-cache, no-store"
}
rw.Header().Set("Cache-Control", cacheControl)
}
// responseString responses the s as a "text/plain" content to the client with
// the statusCode.
func responseString(rw http.ResponseWriter, statusCode int, s string) {
rw.Header().Set("Content-Type", "text/plain; charset=utf-8")
rw.WriteHeader(statusCode)
rw.Write([]byte(s))
}
// responseJSON responses the b as a "application/json" content to the client
// with the statusCode.
func responseJSON(rw http.ResponseWriter, statusCode int, b []byte) {
rw.Header().Set("Content-Type", "application/json; charset=utf-8")
rw.WriteHeader(statusCode)
rw.Write(b)
}
// responseNotFound responses "not found" to the client with the optional msgs.
func responseNotFound(rw http.ResponseWriter, msgs ...interface{}) {
var msg string
if len(msgs) > 0 {
msg = strings.TrimPrefix(fmt.Sprint(msgs...), "bad request: ")
msg = strings.TrimPrefix(msg, "gone: ")
if msg != "" && !strings.HasPrefix(msg, "not found: ") {
msg = fmt.Sprint("not found: ", msg)
}
}
if msg == "" {
msg = "not found"
}
responseString(rw, http.StatusNotFound, msg)
}
// responseMethodNotAllowed responses "method not allowed" to the client.
func responseMethodNotAllowed(rw http.ResponseWriter) {
responseString(rw, http.StatusMethodNotAllowed, "method not allowed")
}
// responseInternalServerError responses "internal server error" to the client.
func responseInternalServerError(rw http.ResponseWriter) {
responseString(
rw,
http.StatusInternalServerError,
"internal server error",
)
}
// responseModError responses the err as a mod operation error to the client.
func responseModError(rw http.ResponseWriter, err error, cacheSensitive bool) {
if errors.Is(err, errNotFound) {
msg := err.Error()
if strings.Contains(msg, errBadUpstream.Error()) {
msg = errBadUpstream.Error()
setResponseCacheControlHeader(rw, -1)
} else if strings.Contains(msg, errFetchTimedOut.Error()) {
msg = errFetchTimedOut.Error()
setResponseCacheControlHeader(rw, -1)
} else if cacheSensitive {
setResponseCacheControlHeader(rw, 60)
} else {
setResponseCacheControlHeader(rw, 600)
}
responseNotFound(rw, msg)
} else if errors.Is(err, errBadUpstream) {
setResponseCacheControlHeader(rw, -1)
responseNotFound(rw, errBadUpstream)
} else if ue, ok := err.(*url.Error); (ok && ue.Timeout()) ||
errors.Is(err, context.DeadlineExceeded) ||
errors.Is(err, errFetchTimedOut) ||
strings.Contains(err.Error(), errFetchTimedOut.Error()) {
setResponseCacheControlHeader(rw, -1)
responseNotFound(rw, errFetchTimedOut)
} else {
responseInternalServerError(rw)
}
}