Merge pull request #10 from jimeh/release-please--branches--main

Remove the kingpin external dependency, and instead just use Go's stdlib
flag package.

BREAKING CHANGE: Long versions of command line flags are no longer supported.

.github/workflows/ci.yml

@@ -17,13 +17,25 @@ jobs:
         run: make
       - name: Run and make request
         run: |
-          ./bin/casecmp --port=8080 &
+          ./bin/casecmp -p 8080 &
           curl --silent --retry 10 --retry-delay 1 --retry-connrefused \
               http://localhost:8080/
 
+  helm-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: azure/setup-helm@v3
+        with:
+          token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Lint chart
+        run: helm lint chart
+      - name: Template chart
+        run: helm template chart
+
   release-please:
     runs-on: ubuntu-latest
-    needs: [build]
+    needs: [build, helm-lint]
     if: github.ref == 'refs/heads/main'
     steps:
       - uses: google-github-actions/release-please-action@v3

.goreleaser.yml

@@ -23,14 +23,19 @@ builds:
       - "6"
       - "7"
 
+universal_binaries:
+  - replace: false
+
 archives:
   - format: tar.gz
     name_template: |-
-      {{ .ProjectName }}-{{ .Version }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}
+      {{ .ProjectName }}-{{ .Version }}_{{ .Os }}_{{ if eq .Arch "all" }}universal{{ else }}{{ .Arch }}{{ end }}{{ if .Arm }}v{{ .Arm }}{{ end }}{{ if not (eq .Amd64 "v1") }}{{ .Amd64 }}{{ end }}
     wrap_in_directory: true
     format_overrides:
       - goos: windows
         format: zip
+    replacements:
+      darwin: macos
 
 checksum:
   name_template: "checksums.txt"

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "1.5.0"
+  ".": "2.1.0"
 }

CHANGELOG.md

@@ -1,5 +1,26 @@
 # Changelog
 
+## [2.1.0](https://github.com/jimeh/casecmp/compare/v2.0.0...v2.1.0) (2022-11-14)
+
+
+### Features
+
+* **helm-chart:** add casecmp.httpsExamples value ([406f21f](https://github.com/jimeh/casecmp/commit/406f21f72115884503bfe3e928d993a536eb45b2))
+* **json:** add support for JSON request and response types ([0658bad](https://github.com/jimeh/casecmp/commit/0658bad90257aa55bfadea6b6167337b21df1a13))
+
+## [2.0.0](https://github.com/jimeh/casecmp/compare/v1.5.0...v2.0.0) (2022-11-14)
+
+
+### ⚠ BREAKING CHANGES
+
+* Long versions of command line flags are no longer supported.
+
+### Features
+
+* **chart:** add kubernetes helm chart ([4e36d51](https://github.com/jimeh/casecmp/commit/4e36d51dc1c081fd50b1397eabb736ad3fe21541))
+* **env:** support BIND environment variable ([623d2c2](https://github.com/jimeh/casecmp/commit/623d2c21b0a25d3b54b6cf3e18fc147a2faa8cd6))
+* remove external dependencies ([9a904fe](https://github.com/jimeh/casecmp/commit/9a904fee99e203d7ddb2a84e2d056d3ed8ec197a))
+
 ## [1.5.0](https://github.com/jimeh/casecmp/compare/v1.4.0...v1.5.0) (2022-11-14)
 
 

Makefile

@@ -4,11 +4,10 @@ VERSION ?= $(shell cat VERSION)
 SOURCES = $(shell find . -name '*.go' -o -name 'Makefile')
 
 $(BINARY): $(SOURCES)
-	CGO_ENABLED=0 go build -a -o ${BINARY} -ldflags \ "\
+	CGO_ENABLED=0 go build -o ${BINARY} -ldflags \ "\
 		-s -w \
 		-X main.version=${VERSION} \
-		-X main.commit=$(shell git show --format="%h" --no-patch) \
-		-X main.date=$(shell date +%Y-%m-%dT%T%z)"
+		-X main.commit=$(shell git show --format="%h" --no-patch)"
 
 .PHONY: build
 build: $(BINARY)

chart/.helmignore

@@ -0,0 +1,23 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

chart/Chart.yaml

@@ -0,0 +1,24 @@
+apiVersion: v2
+name: casecmp
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 2.1.0 # x-release-please-version
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: 2.1.0 # x-release-please-version

chart/templates/NOTES.txt

@@ -0,0 +1,22 @@
+1. Get the application URL by running these commands:
+{{- if .Values.ingress.enabled }}
+{{- range $host := .Values.ingress.hosts }}
+  {{- range .paths }}
+  http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
+  {{- end }}
+{{- end }}
+{{- else if contains "NodePort" .Values.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "casecmp.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "casecmp.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "casecmp.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
+  echo http://$SERVICE_IP:{{ .Values.service.port }}
+{{- else if contains "ClusterIP" .Values.service.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "casecmp.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
+{{- end }}

chart/templates/_helpers.tpl

@@ -0,0 +1,62 @@
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "casecmp.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "casecmp.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "casecmp.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "casecmp.labels" -}}
+helm.sh/chart: {{ include "casecmp.chart" . }}
+{{ include "casecmp.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "casecmp.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "casecmp.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "casecmp.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "casecmp.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}

chart/templates/deployment.yaml

@@ -0,0 +1,64 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "casecmp.fullname" . }}
+  labels:
+    {{- include "casecmp.labels" . | nindent 4 }}
+spec:
+  {{- if not .Values.autoscaling.enabled }}
+  replicas: {{ .Values.replicaCount }}
+  {{- end }}
+  selector:
+    matchLabels:
+      {{- include "casecmp.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      {{- with .Values.podAnnotations }}
+      annotations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      labels:
+        {{- include "casecmp.selectorLabels" . | nindent 8 }}
+    spec:
+      {{- with .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      serviceAccountName: {{ include "casecmp.serviceAccountName" . }}
+      securityContext:
+        {{- toYaml .Values.podSecurityContext | nindent 8 }}
+      containers:
+        - name: {{ .Chart.Name }}
+          securityContext:
+            {{- toYaml .Values.securityContext | nindent 12 }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          env:
+            - name: "FORCE_HTTPS"
+              value: "{{ if .Values.casecmp.httpsExamples }}true{{ end }}"
+          ports:
+            - name: http
+              containerPort: 8080
+              protocol: TCP
+          livenessProbe:
+            httpGet:
+              path: /
+              port: http
+          readinessProbe:
+            httpGet:
+              path: /
+              port: http
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}

chart/templates/hpa.yaml

@@ -0,0 +1,28 @@
+{{- if .Values.autoscaling.enabled }}
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ include "casecmp.fullname" . }}
+  labels:
+    {{- include "casecmp.labels" . | nindent 4 }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ include "casecmp.fullname" . }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  metrics:
+    {{- if .Values.autoscaling.targetCPUUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: cpu
+        targetAverageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
+    {{- end }}
+    {{- if .Values.autoscaling.targetMemoryUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: memory
+        targetAverageUtilization: {{ .Values.autoscaling.targetMemoryUtilizationPercentage }}
+    {{- end }}
+{{- end }}

chart/templates/ingress.yaml

@@ -0,0 +1,61 @@
+{{- if .Values.ingress.enabled -}}
+{{- $fullName := include "casecmp.fullname" . -}}
+{{- $svcPort := .Values.service.port -}}
+{{- if and .Values.ingress.className (not (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion)) }}
+  {{- if not (hasKey .Values.ingress.annotations "kubernetes.io/ingress.class") }}
+  {{- $_ := set .Values.ingress.annotations "kubernetes.io/ingress.class" .Values.ingress.className}}
+  {{- end }}
+{{- end }}
+{{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1
+{{- else if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1beta1
+{{- else -}}
+apiVersion: extensions/v1beta1
+{{- end }}
+kind: Ingress
+metadata:
+  name: {{ $fullName }}
+  labels:
+    {{- include "casecmp.labels" . | nindent 4 }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  {{- if and .Values.ingress.className (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) }}
+  ingressClassName: {{ .Values.ingress.className }}
+  {{- end }}
+  {{- if .Values.ingress.tls }}
+  tls:
+    {{- range .Values.ingress.tls }}
+    - hosts:
+        {{- range .hosts }}
+        - {{ . | quote }}
+        {{- end }}
+      secretName: {{ .secretName }}
+    {{- end }}
+  {{- end }}
+  rules:
+    {{- range .Values.ingress.hosts }}
+    - host: {{ .host | quote }}
+      http:
+        paths:
+          {{- range .paths }}
+          - path: {{ .path }}
+            {{- if and .pathType (semverCompare ">=1.18-0" $.Capabilities.KubeVersion.GitVersion) }}
+            pathType: {{ .pathType }}
+            {{- end }}
+            backend:
+              {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }}
+              service:
+                name: {{ $fullName }}
+                port:
+                  number: {{ $svcPort }}
+              {{- else }}
+              serviceName: {{ $fullName }}
+              servicePort: {{ $svcPort }}
+              {{- end }}
+          {{- end }}
+    {{- end }}
+{{- end }}

chart/templates/service.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "casecmp.fullname" . }}
+  labels:
+    {{- include "casecmp.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: http
+      protocol: TCP
+      name: http
+  selector:
+    {{- include "casecmp.selectorLabels" . | nindent 4 }}

chart/templates/serviceaccount.yaml

@@ -0,0 +1,12 @@
+{{- if .Values.serviceAccount.create -}}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ include "casecmp.serviceAccountName" . }}
+  labels:
+    {{- include "casecmp.labels" . | nindent 4 }}
+  {{- with .Values.serviceAccount.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+{{- end }}

chart/templates/tests/test-connection.yaml

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: "{{ include "casecmp.fullname" . }}-test-connection"
+  labels:
+    {{- include "casecmp.labels" . | nindent 4 }}
+  annotations:
+    "helm.sh/hook": test
+spec:
+  containers:
+    - name: wget
+      image: busybox
+      command: ['wget']
+      args: ['{{ include "casecmp.fullname" . }}:{{ .Values.service.port }}']
+  restartPolicy: Never

chart/values.yaml

@@ -0,0 +1,90 @@
+# Default values for casecmp.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+replicaCount: 1
+
+image:
+  repository: ghcr.io/jimeh/casecmp
+  pullPolicy: IfNotPresent
+  # Overrides the image tag whose default is the chart appVersion.
+  tag: ""
+
+casecmp:
+  # Use "https://" scheme in examples.
+  httpsExamples: false
+
+imagePullSecrets: []
+nameOverride: ""
+fullnameOverride: ""
+
+serviceAccount:
+  # Specifies whether a service account should be created
+  create: true
+  # Annotations to add to the service account
+  annotations: {}
+  # The name of the service account to use.
+  # If not set and create is true, a name is generated using the fullname template
+  name: ""
+
+podAnnotations: {}
+
+podSecurityContext:
+  {}
+  # fsGroup: 2000
+
+securityContext:
+  {}
+  # capabilities:
+  #   drop:
+  #   - ALL
+  # readOnlyRootFilesystem: true
+  # runAsNonRoot: true
+  # runAsUser: 1000
+
+service:
+  type: ClusterIP
+  port: 80
+
+ingress:
+  enabled: false
+  className: ""
+  annotations:
+    {}
+    # kubernetes.io/ingress.class: nginx
+    # kubernetes.io/tls-acme: "true"
+  hosts:
+    - host: chart-example.local
+      paths:
+        - path: /
+          pathType: Prefix
+  tls: []
+  #  - secretName: chart-example-tls
+  #    hosts:
+  #      - chart-example.local
+
+resources:
+  {}
+  # We usually recommend not to specify default resources and to leave this as a conscious
+  # choice for the user. This also increases chances charts run on environments with little
+  # resources, such as Minikube. If you do want to specify resources, uncomment the following
+  # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+  # limits:
+  #   cpu: 100m
+  #   memory: 128Mi
+  # requests:
+  #   cpu: 100m
+  #   memory: 128Mi
+
+autoscaling:
+  enabled: false
+  minReplicas: 1
+  maxReplicas: 100
+  targetCPUUtilizationPercentage: 80
+  # targetMemoryUtilizationPercentage: 80
+
+nodeSelector: {}
+
+tolerations: []
+
+affinity: {}

go.mod

@@ -1,11 +1,3 @@
 module github.com/jimeh/casecmp
 
 go 1.19
-
-require gopkg.in/alecthomas/kingpin.v2 v2.2.6
-
-require (
-	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
-	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 // indirect
-	github.com/stretchr/testify v1.7.0 // indirect
-)

go.sum

@@ -1,18 +0,0 @@
-github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
-github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 h1:s6gZFSlWYmbqAuRjVTiNNhvNRfY2Wxp9nhfyel4rklc=
-github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137/go.mod h1:OMCwj8VM1Kc9e19TLln2VL61YJF0x1XFtfdL4JdbSyE=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -2,52 +2,70 @@ package main
 
 import (
 	"bytes"
+	"encoding/json"
+	"flag"
 	"fmt"
+	"io"
 	"log"
 	"net/http"
 	"os"
+	"strconv"
 	"strings"
+	"text/template"
 	"time"
-
-	"gopkg.in/alecthomas/kingpin.v2"
 )
 
 var (
+	version = "dev"
+	commit  = "unknown"
+)
+
+const (
 	name        = "casecmp"
-	version     = "dev"
-	commit      = "unknown"
-	date        = "unknown"
-	defaultPort = "8080"
+	defaultPort = 8080
+	defaultBind = "0.0.0.0"
 )
 
 // Argument parsing setup.
 var (
-	portFlag = kingpin.Flag("port", "Port to listen to.").Short('p').
-			Default("").String()
-	bindFlag = kingpin.Flag("bind", "Bind address.").Short('b').
-			Default("0.0.0.0").String()
-	forceHTTPSFlag = kingpin.Flag(
-		"force-https", "Use https:// in example curl commands",
-	).Bool()
-	versionFlag = kingpin.Flag("version", "Print version info.").
-			Short('v').Bool()
+	portFlag       = flag.Int("p", defaultPort, "Port to listen on")
+	bindFlag       = flag.String("b", defaultBind, "Bind address")
+	forceHTTPSFlag = flag.Bool(
+		"f", false, "Use https:// in example curl commands",
+	)
+	versionFlag = flag.Bool("v", false, "Print version info")
 )
 
+type IndexData struct {
+	Name    string
+	Version string
+	Scheme  string
+	Host    string
+}
+
+var indexTpl = template.Must(template.New("index").Parse(`{{.Name}} {{.Version}}
+
+Case-insensitive string comparison, as an API. Because ¯\_(ツ)_/¯
+
+Example usage:
+curl -X POST -F "a=Foo Bar" -F "b=FOO BAR" {{.Scheme}}://{{.Host}}/
+curl -X GET "{{.Scheme}}://{{.Host}}/?a=Foo+Bar&b=FOO+BAR"
+curl -X GET -H "Accept: application/json" "{{.Scheme}}://{{.Host}}/?a=Foo+Bar&b=FOO+BAR"
+curl -X POST -H "Content-Type: application/json" -d '{"a":"Foo Bar","b":"FOO BAR"}' {{.Scheme}}://{{.Host}}/
+`))
+
 func indexHandler(w http.ResponseWriter, r *http.Request) {
 	scheme := "http"
 	if r.TLS != nil || *forceHTTPSFlag {
 		scheme = "https"
 	}
 
-	_, err := fmt.Fprintf(w, `%s %s
-
-Case-insensitive string comparison, as an API. Because ¯\_(ツ)_/¯
-
-Example usage:
-curl -X POST -F "a=Foo Bar" -F "b=FOO BAR" %s://%s/
-curl -X GET "%s://%s/?a=Foo+Bar&b=FOO+BAR"
-`,
-		name, version, scheme, r.Host, scheme, r.Host)
+	err := indexTpl.Execute(w, &IndexData{
+		Name:    name,
+		Version: version,
+		Scheme:  scheme,
+		Host:    r.Host,
+	})
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -65,25 +83,59 @@ https://github.com/jimeh/casecmp
 	}
 }
 
-func casecmpHandler(w http.ResponseWriter, r *http.Request) {
-	a := r.FormValue("a")
-	b := r.FormValue("b")
-	resp := "0"
+type JSONData struct {
+	A string `json:"a"`
+	B string `json:"b"`
+}
 
+func casecmpHandler(w http.ResponseWriter, r *http.Request) error {
+	var a, b string
+
+	contentType := r.Header.Get("Content-Type")
+	if strings.Contains(contentType, "application/json") {
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			return err
+		}
+
+		d := JSONData{}
+		err = json.Unmarshal(body, &d)
+		if err != nil {
+			return err
+		}
+
+		a = d.A
+		b = d.B
+	} else {
+		a = r.FormValue("a")
+		b = r.FormValue("b")
+	}
+
+	resp := "0"
 	if strings.EqualFold(string(a), string(b)) {
 		resp = "1"
 	}
-	_, err := fmt.Fprint(w, resp)
-	if err != nil {
-		log.Fatal(err)
+
+	accept := r.Header.Get("Accept")
+	if strings.Contains(accept, "application/json") {
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
+		_, err := fmt.Fprintf(w, `{"result":%s}`, resp)
+		return err
 	}
+
+	_, err := fmt.Fprint(w, resp)
+	return err
 }
 
 func handler(w http.ResponseWriter, r *http.Request) {
 	switch r.URL.Path {
 	case "/":
 		if r.Method != "GET" || r.URL.RawQuery != "" {
-			casecmpHandler(w, r)
+			err := casecmpHandler(w, r)
+			if err != nil {
+				w.WriteHeader(http.StatusInternalServerError)
+				_, _ = fmt.Fprint(w, err.Error())
+			}
 			return
 		}
 		indexHandler(w, r)
@@ -105,13 +157,23 @@ func printVersion() {
 	fmt.Println(buffer.String())
 }
 
-func startServer() {
-	if *portFlag == "" {
+func startServer() error {
+	if *portFlag == defaultPort {
 		envPort := os.Getenv("PORT")
 		if envPort != "" {
-			*portFlag = envPort
-		} else {
-			*portFlag = defaultPort
+			v, err := strconv.Atoi(envPort)
+			if err != nil {
+				return err
+			}
+
+			*portFlag = v
+		}
+	}
+
+	if *bindFlag == defaultBind {
+		envBind := os.Getenv("BIND")
+		if envBind != "" {
+			*bindFlag = envBind
 		}
 	}
 
@@ -119,8 +181,9 @@ func startServer() {
 		*forceHTTPSFlag = true
 	}
 
-	address := *bindFlag + ":" + *portFlag
+	address := fmt.Sprintf("%s:%d", *bindFlag, *portFlag)
 	fmt.Printf("Listening on %s\n", address)
+
 	srv := &http.Server{
 		ReadTimeout:  5 * time.Second,
 		WriteTimeout: 5 * time.Second,
@@ -129,15 +192,19 @@ func startServer() {
 		Addr:         address,
 	}
 
-	log.Fatal(srv.ListenAndServe())
+	return srv.ListenAndServe()
 }
 
 func main() {
-	kingpin.Parse()
+	flag.Parse()
 
 	if *versionFlag {
 		printVersion()
-	} else {
-		startServer()
+		return
+	}
+
+	err := startServer()
+	if err != nil {
+		log.Fatal(err)
 	}
 }

release-please-config.json

@@ -1,17 +1,15 @@
 {
-  "bootstrap-sha": "b7f4d11fc99f9ffa85376c5757d8dd8c6341c38a",
-  "last-release-sha": "b7f4d11fc99f9ffa85376c5757d8dd8c6341c38a",
   "release-type": "go",
   "bump-minor-pre-major": true,
   "bump-patch-for-minor-pre-major": true,
   "packages": {
     ".": {
       "changelog-path": "CHANGELOG.md",
-      "bump-minor-pre-major": false,
-      "bump-patch-for-minor-pre-major": false,
       "draft": false,
       "prerelease": false,
-      "extra-files": []
+      "extra-files": [
+        "chart/Chart.yaml"
+      ]
     }
   },
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"