diff --git a/.github/workflows/cloc.yml b/.github/workflows/cloc.yml
index ed1ddb9..7002b22 100644
--- a/.github/workflows/cloc.yml
+++ b/.github/workflows/cloc.yml
@@ -18,14 +18,14 @@ jobs:
       - name: Count Lines Of Code
         id: loc
         run: |
-          curl -OL https://github.com/vearutop/sccdiff/releases/download/v1.0.1/linux_amd64.tar.gz && tar xf linux_amd64.tar.gz
+          curl -sLO https://github.com/vearutop/sccdiff/releases/download/v1.0.1/linux_amd64.tar.gz && tar xf linux_amd64.tar.gz
           OUTPUT=$(cd pr && ../sccdiff -basedir ../base)
-          OUTPUT="${OUTPUT//'%'/'%25'}"
-          OUTPUT="${OUTPUT//$'\n'/'%0A'}"
-          OUTPUT="${OUTPUT//$'\r'/'%0D'}"
+          echo "${OUTPUT}"
+          OUTPUT="${OUTPUT//$'\n'/%0A}"
           echo "::set-output name=diff::$OUTPUT"
 
       - name: Comment Code Lines
+        continue-on-error: true
         uses: marocchino/sticky-pull-request-comment@v2
         with:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
index cf9c148..58c0ec6 100644
--- a/.github/workflows/golangci-lint.yml
+++ b/.github/workflows/golangci-lint.yml
@@ -18,7 +18,7 @@ jobs:
         uses: golangci/golangci-lint-action@v2.5.2
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
-          version: v1.41.1
+          version: v1.43.0
 
           # Optional: working directory, useful for monorepos
           # working-directory: somedir
diff --git a/.github/workflows/gorelease.yml b/.github/workflows/gorelease.yml
index a733761..94c6966 100644
--- a/.github/workflows/gorelease.yml
+++ b/.github/workflows/gorelease.yml
@@ -3,18 +3,25 @@ name: gorelease
 on:
   pull_request:
 env:
-  GO111MODULE: "on"
+  GO_VERSION: 1.17.x
 jobs:
   gorelease:
-    strategy:
-      matrix:
-        go-version: [ 1.17.x ]
     runs-on: ubuntu-latest
     steps:
-      - name: Install Go
+      - name: Install Go stable
+        if: env.GO_VERSION != 'tip'
         uses: actions/setup-go@v2
         with:
-          go-version: ${{ matrix.go-version }}
+          go-version: ${{ env.GO_VERSION }}
+      - name: Install Go tip
+        if: env.GO_VERSION == 'tip'
+        run: |
+          curl -sL https://storage.googleapis.com/go-build-snap/go/linux-amd64/$(git ls-remote https://github.com/golang/go.git HEAD | awk '{print $1;}').tar.gz -o gotip.tar.gz
+          ls -lah gotip.tar.gz
+          mkdir -p ~/sdk/gotip
+          tar -C ~/sdk/gotip -xzf gotip.tar.gz
+          ~/sdk/gotip/bin/go version
+          echo "PATH=$HOME/go/bin:$HOME/sdk/gotip/bin/:$PATH" >> $GITHUB_ENV
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Gorelease cache
@@ -28,17 +35,16 @@ jobs:
         run: |
           test -e ~/go/bin/gorelease || go install golang.org/x/exp/cmd/gorelease@latest
           OUTPUT=$(gorelease || exit 0)
-          OUTPUT="${OUTPUT//'%'/'%25'}"
-          OUTPUT="${OUTPUT//$'\n'/'%0A'}"
-          OUTPUT="${OUTPUT//$'\r'/'%0D'}"
+          echo "${OUTPUT}"
+          OUTPUT="${OUTPUT//$'\n'/%0A}"
           echo "::set-output name=report::$OUTPUT"
       - name: Comment Report
+        continue-on-error: true
         uses: marocchino/sticky-pull-request-comment@v2
         with:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           header: gorelease
           message: |
-            ### API Changes
+            ### Go API Changes
 
             <pre>
             ${{ steps.gorelease.outputs.report }}
diff --git a/.github/workflows/test-unit.yml b/.github/workflows/test-unit.yml
index 79ed0f6..6442393 100644
--- a/.github/workflows/test-unit.yml
+++ b/.github/workflows/test-unit.yml
@@ -9,17 +9,28 @@ on:
 env:
   GO111MODULE: "on"
   RUN_BASE_COVERAGE: "on"  # Runs test for PR base in case base test coverage is missing.
+  COV_GO_VERSION: 1.17.x   # Version of Go to collect coverage
 jobs:
   test:
     strategy:
       matrix:
-        go-version: [ 1.13.x, 1.14.x, 1.15.x, 1.16.x, 1.17.x ]
+        go-version: [ 1.16.x, 1.17.x, tip ]
     runs-on: ubuntu-latest
     steps:
-      - name: Install Go
+      - name: Install Go stable
+        if: matrix.go-version != 'tip'
         uses: actions/setup-go@v2
         with:
           go-version: ${{ matrix.go-version }}
+      - name: Install Go tip
+        if: matrix.go-version == 'tip'
+        run: |
+          curl -sL https://storage.googleapis.com/go-build-snap/go/linux-amd64/$(git ls-remote https://github.com/golang/go.git HEAD | awk '{print $1;}').tar.gz -o gotip.tar.gz
+          ls -lah gotip.tar.gz
+          mkdir -p ~/sdk/gotip
+          tar -C ~/sdk/gotip -xzf gotip.tar.gz
+          ~/sdk/gotip/bin/go version
+          echo "PATH=$HOME/go/bin:$HOME/sdk/gotip/bin/:$PATH" >> $GITHUB_ENV
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Go cache
@@ -35,7 +46,8 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go-cache
       - name: Restore base test coverage
-        if: matrix.go-version == '1.17.x'
+        id: base-coverage
+        if: matrix.go-version == env.COV_GO_VERSION
         uses: actions/cache@v2
         with:
           path: |
@@ -43,13 +55,13 @@ jobs:
           # Use base sha for PR or new commit hash for master/main push in test result key.
           key: ${{ runner.os }}-unit-test-coverage-${{ (github.event.pull_request.base.sha != github.event.after) && github.event.pull_request.base.sha || github.event.after }}
       - name: Checkout base code
-        if: matrix.go-version == '1.17.x' && env.RUN_BASE_COVERAGE == 'on' && steps.benchmark-base.outputs.cache-hit != 'true' && github.event.pull_request.base.sha != ''
+        if: matrix.go-version == env.COV_GO_VERSION && env.RUN_BASE_COVERAGE == 'on' && steps.base-coverage.outputs.cache-hit != 'true' && github.event.pull_request.base.sha != ''
         uses: actions/checkout@v2
         with:
           ref: ${{ github.event.pull_request.base.sha }}
           path: __base
       - name: Run test for base code
-        if: matrix.go-version == '1.17.x' && env.RUN_BASE_COVERAGE == 'on' && steps.benchmark-base.outputs.cache-hit != 'true' && github.event.pull_request.base.sha != ''
+        if: matrix.go-version == env.COV_GO_VERSION && env.RUN_BASE_COVERAGE == 'on' && steps.base-coverage.outputs.cache-hit != 'true' && github.event.pull_request.base.sha != ''
         run: |
           cd __base
           make | grep test-unit && (make test-unit && go tool cover -func=./unit.coverprofile | sed -e 's/.go:[0-9]*:\t/.go\t/g' | sed -e 's/\t\t*/\t/g'  > ../unit-base.txt) || echo "No test-unit in base"
@@ -59,17 +71,18 @@ jobs:
           make test-unit
           go tool cover -func=./unit.coverprofile | sed -e 's/.go:[0-9]*:\t/.go\t/g' | sed -e 's/\t\t*/\t/g'  > unit.txt
           OUTPUT=$(test -e unit-base.txt && (diff unit-base.txt unit.txt || exit 0) || cat unit.txt)
-          OUTPUT="${OUTPUT//'%'/'%25'}"
-          OUTPUT="${OUTPUT//$'\n'/'%0A'}"
-          OUTPUT="${OUTPUT//$'\r'/'%0D'}"
+          echo "${OUTPUT}"
+          OUTPUT="${OUTPUT//$'\n'/%0A}"
           TOTAL=$(grep 'total:' unit.txt)
+          echo "${TOTAL}"
           echo "::set-output name=diff::$OUTPUT"
           echo "::set-output name=total::$TOTAL"
       - name: Store base coverage
         if: ${{ github.ref == 'refs/heads/master' || github.ref == 'refs/heads/main' }}
         run: cp unit.txt unit-base.txt
       - name: Comment Test Coverage
-        if: matrix.go-version == '1.17.x'
+        continue-on-error: true
+        if: matrix.go-version == env.COV_GO_VERSION
         uses: marocchino/sticky-pull-request-comment@v2
         with:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -85,7 +98,7 @@ jobs:
             </details>
 
       - name: Upload code coverage
-        if: matrix.go-version == '1.17.x'
+        if: matrix.go-version == env.COV_GO_VERSION
         uses: codecov/codecov-action@v1
         with:
           file: ./unit.coverprofile
diff --git a/.golangci.yml b/.golangci.yml
index b92c359..9f44941 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -36,6 +36,10 @@ linters:
     - scopelint # deprecated
     - ifshort # too many false positives
     - golint # deprecated
+    - varnamelen
+    - tagliatelle
+    - errname
+    - ireturn
 
 issues:
   exclude-use-default: false
diff --git a/Makefile b/Makefile
index dba2b08..32cb7be 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-#GOLANGCI_LINT_VERSION := "v1.41.1" # Optional configuration to pinpoint golangci-lint version.
+#GOLANGCI_LINT_VERSION := "v1.43.0" # Optional configuration to pinpoint golangci-lint version.
 
 # The head of Makefile determines location of dev-go to include standard targets.
 GO ?= go
@@ -30,7 +30,6 @@ endif
 -include $(DEVGO_PATH)/makefiles/main.mk
 -include $(DEVGO_PATH)/makefiles/lint.mk
 -include $(DEVGO_PATH)/makefiles/test-unit.mk
--include $(DEVGO_PATH)/makefiles/bench.mk
 -include $(DEVGO_PATH)/makefiles/reset-ci.mk
 
 # Add your custom targets here.
diff --git a/go.mod b/go.mod
index 62de748..5e29a0f 100644
--- a/go.mod
+++ b/go.mod
@@ -1,11 +1,21 @@
 module github.com/bool64/httpmock
 
-go 1.13
+go 1.17
 
 require (
-	github.com/bool64/dev v0.1.42
-	github.com/bool64/shared v0.1.3
-	github.com/sergi/go-diff v1.2.0 // indirect
+	github.com/bool64/dev v0.2.5
+	github.com/bool64/shared v0.1.4
 	github.com/stretchr/testify v1.4.0
 	github.com/swaggest/assertjson v1.6.8
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/iancoleman/orderedmap v0.2.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/sergi/go-diff v1.2.0 // indirect
+	github.com/yosuke-furukawa/json5 v0.1.2-0.20201207051438-cf7bb3f354ff // indirect
+	github.com/yudai/gojsondiff v1.0.0 // indirect
+	github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
diff --git a/go.sum b/go.sum
index ab49b59..d7fd00f 100644
--- a/go.sum
+++ b/go.sum
@@ -1,9 +1,10 @@
 github.com/bool64/dev v0.1.25/go.mod h1:cTHiTDNc8EewrQPy3p1obNilpMpdmlUesDkFTF2zRWU=
 github.com/bool64/dev v0.1.41/go.mod h1:cTHiTDNc8EewrQPy3p1obNilpMpdmlUesDkFTF2zRWU=
-github.com/bool64/dev v0.1.42 h1:Ps0IvNNf/v1MlIXt8Q5YKcKjYsIVLY/fb/5BmA7gepg=
-github.com/bool64/dev v0.1.42/go.mod h1:cTHiTDNc8EewrQPy3p1obNilpMpdmlUesDkFTF2zRWU=
-github.com/bool64/shared v0.1.3 h1:gj7XZPYa1flQsCg3q9AIju+W2A1jaexK0fdFu2XtaG0=
+github.com/bool64/dev v0.2.5 h1:H0bylghwcjDBBhEwSFTjArEO9Dr8cCaB54QSOF7esOA=
+github.com/bool64/dev v0.2.5/go.mod h1:cTHiTDNc8EewrQPy3p1obNilpMpdmlUesDkFTF2zRWU=
 github.com/bool64/shared v0.1.3/go.mod h1:RF1p1Oi29ofgOvinBpetbF5mceOUP3kpMkvLbWOmtm0=
+github.com/bool64/shared v0.1.4 h1:zwtb1dl2QzDa9TJOq2jzDTdb5IPf9XlxTGKN8cySWT0=
+github.com/bool64/shared v0.1.4/go.mod h1:ryGjsnQFh6BnEXClfVlEJrzjwzat7CmA8PNS5E+jPp0=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -17,16 +18,13 @@ github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrU
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
 github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
-github.com/golang/protobuf v1.4.3 h1:JjCZWpVbqXDqFVmTfYWEVTMIYrL/NPdPSCHPJ0T/raM=
 github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/iancoleman/orderedmap v0.2.0 h1:sq1N/TFpYH++aViPcaKjys3bDClUEU7s5B+z6jq8pNA=
 github.com/iancoleman/orderedmap v0.2.0/go.mod h1:N0Wam8K1arqPXNWjMo21EXnBPOPp36vB07FNRdD2geA=
-github.com/k0kubun/colorstring v0.0.0-20150214042306-9440f1994b88 h1:uC1QfSlInpQF+M0ao65imhwqKnz3Q2z/d8PWZRMQvDM=
 github.com/k0kubun/colorstring v0.0.0-20150214042306-9440f1994b88/go.mod h1:3w7q1U84EfirKl04SVQ/s7nPm1ZPhiXd34z40TNz36k=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
@@ -102,14 +100,12 @@ golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
diff --git a/server.go b/server.go
old mode 100644
new mode 100755
index aa73c8b..b46119d
--- a/server.go
+++ b/server.go
@@ -34,9 +34,12 @@ type Expectation struct {
 
 // Server serves predefined response for predefined request.
 type Server struct {
-	// OnError is called on expectations mismatch or internal errors.
+	// OnError is called on expectations mismatch or internal errors, optional.
 	OnError func(err error)
 
+	// OnRequest is called on before every request, optional.
+	OnRequest func(rw http.ResponseWriter, req *http.Request)
+
 	// ErrorResponder allows custom failure responses.
 	ErrorResponder func(rw http.ResponseWriter, err error)
 
@@ -179,6 +182,10 @@ func (sm *Server) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 	sm.mu.Lock()
 	defer sm.mu.Unlock()
 
+	if sm.OnRequest != nil {
+		sm.OnRequest(rw, req)
+	}
+
 	if sm.checkAsync(rw, req) {
 		return
 	}