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// Package expfmt contains tools for reading and writing Prometheus metrics.
15package expfmt
16
17// Format specifies the HTTP content type of the different wire protocols.
18type Format string
19
20// Constants to assemble the Content-Type values for the different wire protocols.
21const (
22	TextVersion        = "0.0.4"
23	ProtoType          = `application/vnd.google.protobuf`
24	ProtoProtocol      = `io.prometheus.client.MetricFamily`
25	ProtoFmt           = ProtoType + "; proto=" + ProtoProtocol + ";"
26	OpenMetricsType    = `application/openmetrics-text`
27	OpenMetricsVersion = "0.0.1"
28
29	// The Content-Type values for the different wire protocols.
30	FmtUnknown      Format = `<unknown>`
31	FmtText         Format = `text/plain; version=` + TextVersion + `; charset=utf-8`
32	FmtProtoDelim   Format = ProtoFmt + ` encoding=delimited`
33	FmtProtoText    Format = ProtoFmt + ` encoding=text`
34	FmtProtoCompact Format = ProtoFmt + ` encoding=compact-text`
35	FmtOpenMetrics  Format = OpenMetricsType + `; version=` + OpenMetricsVersion + `; charset=utf-8`
36)
37
38const (
39	hdrContentType = "Content-Type"
40	hdrAccept      = "Accept"
41)
42