cloudflared-mirror/vendor/github.com/pquerna/cachecontrol/cacheobject/warning.go

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/**
* Copyright 2015 Paul Querna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package cacheobject
import (
"fmt"
"net/http"
"time"
)
// Repersents an HTTP Warning: http://tools.ietf.org/html/rfc7234#section-5.5
type Warning int
const (
// Response is Stale
// A cache SHOULD generate this whenever the sent response is stale.
WarningResponseIsStale Warning = 110
// Revalidation Failed
// A cache SHOULD generate this when sending a stale
// response because an attempt to validate the response failed, due to an
// inability to reach the server.
WarningRevalidationFailed Warning = 111
// Disconnected Operation
// A cache SHOULD generate this if it is intentionally disconnected from
// the rest of the network for a period of time.
WarningDisconnectedOperation Warning = 112
// Heuristic Expiration
//
// A cache SHOULD generate this if it heuristically chose a freshness
// lifetime greater than 24 hours and the response's age is greater than
// 24 hours.
WarningHeuristicExpiration Warning = 113
// Miscellaneous Warning
//
// The warning text can include arbitrary information to be presented to
// a human user or logged. A system receiving this warning MUST NOT
// take any automated action, besides presenting the warning to the
// user.
WarningMiscellaneousWarning Warning = 199
// Transformation Applied
//
// This Warning code MUST be added by a proxy if it applies any
// transformation to the representation, such as changing the
// content-coding, media-type, or modifying the representation data,
// unless this Warning code already appears in the response.
WarningTransformationApplied Warning = 214
// Miscellaneous Persistent Warning
//
// The warning text can include arbitrary information to be presented to
// a human user or logged. A system receiving this warning MUST NOT
// take any automated action.
WarningMiscellaneousPersistentWarning Warning = 299
)
func (w Warning) HeaderString(agent string, date time.Time) string {
if agent == "" {
agent = "-"
} else {
// TODO(pquerna): this doesn't escape agent if it contains bad things.
agent = `"` + agent + `"`
}
return fmt.Sprintf(`%d %s "%s" %s`, w, agent, w.String(), date.Format(http.TimeFormat))
}
func (w Warning) String() string {
switch w {
case WarningResponseIsStale:
return "Response is Stale"
case WarningRevalidationFailed:
return "Revalidation Failed"
case WarningDisconnectedOperation:
return "Disconnected Operation"
case WarningHeuristicExpiration:
return "Heuristic Expiration"
case WarningMiscellaneousWarning:
// TODO(pquerna): ideally had a better way to override this one code.
return "Miscellaneous Warning"
case WarningTransformationApplied:
return "Transformation Applied"
case WarningMiscellaneousPersistentWarning:
// TODO(pquerna): same as WarningMiscellaneousWarning
return "Miscellaneous Persistent Warning"
}
panic(w)
}