1// Copyright 2015 The Prometheus Authors
2// Licensed under the Apache License, Version 2.0 (the "License");
3// you may not use this file except in compliance with the License.
4// You may obtain a copy of the License at
5//
6// http://www.apache.org/licenses/LICENSE-2.0
7//
8// Unless required by applicable law or agreed to in writing, software
9// distributed under the License is distributed on an "AS IS" BASIS,
10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11// See the License for the specific language governing permissions and
12// limitations under the License.
13
14// A package for reading and writing Prometheus metrics.
15package expfmt
16
17type Format string
18
19const (
20	TextVersion = "0.0.4"
21
22	ProtoType     = `application/vnd.google.protobuf`
23	ProtoProtocol = `io.prometheus.client.MetricFamily`
24	ProtoFmt      = ProtoType + "; proto=" + ProtoProtocol + ";"
25
26	// The Content-Type values for the different wire protocols.
27	FmtUnknown      Format = `<unknown>`
28	FmtText         Format = `text/plain; version=` + TextVersion
29	FmtProtoDelim   Format = ProtoFmt + ` encoding=delimited`
30	FmtProtoText    Format = ProtoFmt + ` encoding=text`
31	FmtProtoCompact Format = ProtoFmt + ` encoding=compact-text`
32
33	// fmtJSON2 is hidden as it is deprecated.
34	fmtJSON2 Format = `application/json; version=0.0.2`
35)
36
37const (
38	hdrContentType = "Content-Type"
39	hdrAccept      = "Accept"
40)
41