Merge pull request #2088 from fatedier/dev

bump version to v0.34.3

.github/ISSUE_TEMPLATE

@@ -1,29 +0,0 @@
-Issue is only used for submiting bug report and documents typo. If there are same issues or answers can be found in documents, we will close it directly.
-
-Use the commands below to provide key information from your environment:
-You do NOT have to include this information if this is a FEATURE REQUEST
-
-**What version of frp are you using (./frpc -v or ./frps -v)?**
-
-
-**What operating system and processor architecture are you using (`go env`)?**
-
-
-**Configures you used:**
-
-
-**Steps to reproduce the issue:**
-1.
-2.
-3.
-
-**Describe the results you received:**
-
-
-**Describe the results you expected:**
-
-
-**Additional information you deem important (e.g. issue happens only occasionally):**
-
-
-**Can you point out what caused this issue (optional)**

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,44 @@
+---
+name: Bug Report
+about: Bug Report for FRP
+title: ''
+labels: Requires Testing
+assignees: ''
+
+---
+
+<!-- From Chinese to English by machine translation, welcome to revise and polish. -->
+
+<!-- ⚠️⚠️ Incomplete reports will be marked as invalid, and closed, with few exceptions ⚠️⚠️ -->
+<!-- in addition, please use search well so that the same solution can be found in the feedback, we will close it directly -->
+<!-- for convenience of differentiation, use FRPS or FRPC to refer to the FRP server or client -->
+
+**[REQUIRED] hat version of frp are you using** 
+<!-- Use ./frpc -v or ./frps -v -->
+Version:
+
+**[REQUIRED] What operating system and processor architecture are you using**
+OS:
+CPU architecture:
+
+**[REQUIRED] description of errors**
+
+**confile**
+<!-- Please pay attention to hiding the token, server_addr and other privacy information -->
+
+**log file**
+<!--  If the file is too large, use Pastebin, for example https://pastebin.ubuntu.com/ -->
+
+**Steps to reproduce the issue**
+1. 
+2. 
+3. 
+
+**Supplementary information**
+
+**Can you guess what caused this issue**
+
+**Checklist**:
+<!--- Make sure you've completed the following steps (put an "X" between of brackets): -->
+- [] I included all information required in the sections above
+- [] I made sure there are no duplicates of this report [(Use Search)](https://github.com/fatedier/frp/issues?q=is%3Aissue)

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: DOCS
+    url: https://github.com/fatedier/frp
+    about: Here you can find out how to configure frp.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,22 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: "[+] Enhancement"
+assignees: ''
+
+---
+
+<!-- From Chinese to English by machine translation, welcome to revise and polish. -->
+
+**The solution you want**
+<!--A clear and concise description of the solution you want. -->
+
+**Alternatives considered**
+<!--A clear and concise description of any alternative solutions or features you have considered. -->
+
+**How to implement this function**
+<!--Implementation steps for the solution you want. -->
+
+**Application scenarios of this function**
+<!--Make a clear and concise description of the application scenario of the solution you want. -->

.github/workflows/build-and-push-image.yml

@@ -75,41 +75,41 @@ jobs:
         name: Get Image Tag Name
         run: |
           if [ x${{ github.event.inputs.tag }} == x"" ]; then
-            echo ::set-env name=TAG_NAME::${GITHUB_REF#refs/*/}
+            echo "TAG_NAME=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
           else
-            echo ::set-env name=TAG_NAME::${{ github.event.inputs.tag }}
+            echo "TAG_NAME=${{ github.event.inputs.tag }}" >> $GITHUB_ENV
           fi
       # prepare image tags
       -
         name: Prepare Image Tags
         run: |
-          echo ::set-env name=DOCKERFILE_FRPC_PATH::dockerfiles/Dockerfile-for-frpc
+          echo "DOCKERFILE_FRPC_PATH=dockerfiles/Dockerfile-for-frpc" >> $GITHUB_ENV
-          echo ::set-env name=DOCKERFILE_FRPS_PATH::dockerfiles/Dockerfile-for-frps
+          echo "DOCKERFILE_FRPS_PATH=dockerfiles/Dockerfile-for-frps" >> $GITHUB_ENV
-          echo ::set-env name=TAG_FRPC::fatedier/frpc:$TAG_NAME
+          echo "TAG_FRPC=fatedier/frpc:${{ env.TAG_NAME }}" >> $GITHUB_ENV
-          echo ::set-env name=TAG_FRPS::fatedier/frps:$TAG_NAME
+          echo "TAG_FRPS=fatedier/frps:${{ env.TAG_NAME }}" >> $GITHUB_ENV
-          echo ::set-env name=TAG_FRPC_GPR::ghcr.io/fatedier/frpc:$TAG_NAME
+          echo "TAG_FRPC_GPR=ghcr.io/fatedier/frpc:${{ env.TAG_NAME }}" >> $GITHUB_ENV
-          echo ::set-env name=TAG_FRPS_GPR::ghcr.io/fatedier/frps:$TAG_NAME
+          echo "TAG_FRPS_GPR=ghcr.io/fatedier/frps:${{ env.TAG_NAME }}" >> $GITHUB_ENV
       # build images
       -
         name: Build Images
         run: |
           # for Docker hub
-          docker build --file $DOCKERFILE_FRPC_PATH --tag $TAG_FRPC .
+          docker build --file ${{ env.DOCKERFILE_FRPC_PATH }} --tag ${{ env.TAG_FRPC }} .
-          docker build --file $DOCKERFILE_FRPS_PATH --tag $TAG_FRPS .
+          docker build --file ${{ env.DOCKERFILE_FRPS_PATH }} --tag ${{ env.TAG_FRPS }} .
           # for GPR
-          docker build --file $DOCKERFILE_FRPC_PATH --tag $TAG_FRPC_GPR .
+          docker build --file ${{ env.DOCKERFILE_FRPC_PATH }} --tag ${{ env.TAG_FRPC_GPR }} .
-          docker build --file $DOCKERFILE_FRPS_PATH --tag $TAG_FRPS_GPR .
+          docker build --file ${{ env.DOCKERFILE_FRPS_PATH }} --tag ${{ env.TAG_FRPS_GPR }} .
       # push to dockerhub
       -
         name: Publish to Dockerhub
         run: |
           echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login --username ${{ secrets.DOCKERHUB_USERNAME }} --password-stdin
-          docker push $TAG_FRPC
+          docker push ${{ env.TAG_FRPC }}
-          docker push $TAG_FRPS
+          docker push ${{ env.TAG_FRPS }}
       # push to gpr
       -
         name: Publish to GPR
         run: |
           echo ${{ secrets.GPR_TOKEN }} | docker login ghcr.io --username ${{ github.repository_owner }} --password-stdin
-          docker push $TAG_FRPC_GPR
+          docker push ${{ env.TAG_FRPC_GPR }}
-          docker push $TAG_FRPS_GPR
+          docker push ${{ env.TAG_FRPS_GPR }}

.github/workflows/goreleaser.yml

@@ -0,0 +1,30 @@
+name: goreleaser
+
+on:
+  workflow_dispatch:
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+
+      - name: Make All
+        run: |
+          ./package.sh
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist --release-notes=./Release.md
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -29,6 +29,7 @@ packages/
 release/
 test/bin/
 vendor/
+dist/
 
 # Cache
 *.swp

.goreleaser.yml

@@ -0,0 +1,19 @@
+builds:
+  - skip: true
+checksum:
+  name_template: 'checksums.txt'
+release:
+  # Same as for github
+  # Note: it can only be one: either github, gitlab or gitea
+  github:
+    owner: fatedier
+    name: frp
+
+  draft: false
+
+  # You can add extra pre-existing files to the release.
+  # The filename on the release will be the last part of the path (base). If
+  # another file with the same name exists, the latest one found will be used.
+  # Defaults to empty.
+  extra_files:
+    - glob: ./release/packages/*

.travis.yml

@@ -2,8 +2,8 @@ sudo: false
 language: go
 
 go:
-    - 1.13.x
     - 1.14.x
+    - 1.15.x
 
 install:
     - make

Makefile

@@ -20,10 +20,10 @@ fmt:
 	go fmt ./...
 
 frps:
-	env CGO_ENABLED=0 go build -ldflags "$(LDFLAGS)" -o bin/frps ./cmd/frps
+	env CGO_ENABLED=0 go build -trimpath -ldflags "$(LDFLAGS)" -o bin/frps ./cmd/frps
 
 frpc:
-	env CGO_ENABLED=0 go build -ldflags "$(LDFLAGS)" -o bin/frpc ./cmd/frpc
+	env CGO_ENABLED=0 go build -trimpath -ldflags "$(LDFLAGS)" -o bin/frpc ./cmd/frpc
 
 test: gotest
 

Makefile.cross-compiles

@@ -7,32 +7,29 @@ all: build
 build: app
 
 app:
-	env CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_darwin_amd64 ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_darwin_amd64 ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./release/frps_darwin_amd64 ./cmd/frps
+	env CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_darwin_amd64 ./cmd/frps
-	env CGO_ENABLED=0 GOOS=freebsd GOARCH=386 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_freebsd_386 ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=freebsd GOARCH=386 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_freebsd_386 ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=freebsd GOARCH=386 go build -ldflags "$(LDFLAGS)" -o ./release/frps_freebsd_386 ./cmd/frps
+	env CGO_ENABLED=0 GOOS=freebsd GOARCH=386 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_freebsd_386 ./cmd/frps
-	env CGO_ENABLED=0 GOOS=freebsd GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_freebsd_amd64 ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=freebsd GOARCH=amd64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_freebsd_amd64 ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=freebsd GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./release/frps_freebsd_amd64 ./cmd/frps
+	env CGO_ENABLED=0 GOOS=freebsd GOARCH=amd64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_freebsd_amd64 ./cmd/frps
-	env CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_386 ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_386 ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -ldflags "$(LDFLAGS)" -o ./release/frps_linux_386 ./cmd/frps
+	env CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_linux_386 ./cmd/frps
-	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_amd64 ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_amd64 ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./release/frps_linux_amd64 ./cmd/frps
+	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_linux_amd64 ./cmd/frps
-	env CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_arm ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_arm ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -ldflags "$(LDFLAGS)" -o ./release/frps_linux_arm ./cmd/frps
+	env CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_linux_arm ./cmd/frps
-	env CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_arm64 ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_arm64 ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags "$(LDFLAGS)" -o ./release/frps_linux_arm64 ./cmd/frps
+	env CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_linux_arm64 ./cmd/frps
-	env CGO_ENABLED=0 GOOS=windows GOARCH=386 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_windows_386.exe ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=windows GOARCH=386 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_windows_386.exe ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=windows GOARCH=386 go build -ldflags "$(LDFLAGS)" -o ./release/frps_windows_386.exe ./cmd/frps
+	env CGO_ENABLED=0 GOOS=windows GOARCH=386 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_windows_386.exe ./cmd/frps
-	env CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_windows_amd64.exe ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_windows_amd64.exe ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./release/frps_windows_amd64.exe ./cmd/frps
+	env CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_windows_amd64.exe ./cmd/frps
-	env CGO_ENABLED=0 GOOS=linux GOARCH=mips64 go build -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_mips64 ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=linux GOARCH=mips64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_mips64 ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=linux GOARCH=mips64 go build -ldflags "$(LDFLAGS)" -o ./release/frps_linux_mips64 ./cmd/frps
+	env CGO_ENABLED=0 GOOS=linux GOARCH=mips64 go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_linux_mips64 ./cmd/frps
-	env CGO_ENABLED=0 GOOS=linux GOARCH=mips64le go build -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_mips64le ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=linux GOARCH=mips64le go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_mips64le ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=linux GOARCH=mips64le go build -ldflags "$(LDFLAGS)" -o ./release/frps_linux_mips64le ./cmd/frps
+	env CGO_ENABLED=0 GOOS=linux GOARCH=mips64le go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_linux_mips64le ./cmd/frps
-	env CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat go build -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_mips ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_mips ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat go build -ldflags "$(LDFLAGS)" -o ./release/frps_linux_mips ./cmd/frps
+	env CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_linux_mips ./cmd/frps
-	env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_mipsle ./cmd/frpc
+	env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frpc_linux_mipsle ./cmd/frpc
-	env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -ldflags "$(LDFLAGS)" -o ./release/frps_linux_mipsle ./cmd/frps
+	env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -trimpath -ldflags "$(LDFLAGS)" -o ./release/frps_linux_mipsle ./cmd/frps
-
-temp:
-	env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "$(LDFLAGS)" -o ./frps_linux_amd64 ./cmd/frps

Release.md

@@ -0,0 +1,3 @@
+### New
+
+* Command line parameters support `enable_prometheus`.

cmd/frps/root.go

@@ -49,6 +49,7 @@ var (
 	dashboardPort     int
 	dashboardUser     string
 	dashboardPwd      string
+	enablePrometheus  bool
 	assetsDir         string
 	logFile           string
 	logLevel          string
@@ -79,6 +80,7 @@ func init() {
 	rootCmd.PersistentFlags().IntVarP(&dashboardPort, "dashboard_port", "", 0, "dashboard port")
 	rootCmd.PersistentFlags().StringVarP(&dashboardUser, "dashboard_user", "", "admin", "dashboard user")
 	rootCmd.PersistentFlags().StringVarP(&dashboardPwd, "dashboard_pwd", "", "admin", "dashboard password")
+	rootCmd.PersistentFlags().BoolVarP(&enablePrometheus, "enable_prometheus", "", false, "enable prometheus dashboard")
 	rootCmd.PersistentFlags().StringVarP(&logFile, "log_file", "", "console", "log file")
 	rootCmd.PersistentFlags().StringVarP(&logLevel, "log_level", "", "info", "log level")
 	rootCmd.PersistentFlags().Int64VarP(&logMaxDays, "log_max_days", "", 3, "log max days")
@@ -171,6 +173,7 @@ func parseServerCommonCfgFromCmd() (cfg config.ServerCommonConf, err error) {
 	cfg.DashboardPort = dashboardPort
 	cfg.DashboardUser = dashboardUser
 	cfg.DashboardPwd = dashboardPwd
+	cfg.EnablePrometheus = enablePrometheus
 	cfg.LogFile = logFile
 	cfg.LogLevel = logLevel
 	cfg.LogMaxDays = logMaxDays

conf/frpc_full.ini

@@ -22,7 +22,14 @@ log_max_days = 3
 # disable log colors when log_file is console, default is false
 disable_log_color = false
 
-# for authentication
+# for authentication, should be same as your frps.ini
+# AuthenticateHeartBeats specifies whether to include authentication token in heartbeats sent to frps. By default, this value is false.
+authenticate_heartbeats = false
+
+# AuthenticateNewWorkConns specifies whether to include authentication token in new work connections sent to frps. By default, this value is false.
+authenticate_new_work_conns = false
+
+# auth token
 token = 12345678
 
 # set admin address for control frpc's action by http api such as reload

go.mod

@@ -1,6 +1,6 @@
 module github.com/fatedier/frp
 
-go 1.12
+go 1.15
 
 require (
 	github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5

pkg/util/version/version.go

@@ -19,7 +19,7 @@ import (
 	"strings"
 )
 
-var version string = "0.34.1"
+var version string = "0.34.3"
 
 func Full() string {
 	return version

pkg/util/vhost/reverseproxy.go

@@ -13,6 +13,7 @@ import (
 	"log"
 	"net"
 	"net/http"
+	"net/textproto"
 	"net/url"
 	"strings"
 	"sync"
@@ -24,6 +25,19 @@ import (
 // ReverseProxy is an HTTP Handler that takes an incoming request and
 // sends it to another server, proxying the response back to the
 // client.
+//
+// ReverseProxy by default sets the client IP as the value of the
+// X-Forwarded-For header.
+//
+// If an X-Forwarded-For header already exists, the client IP is
+// appended to the existing values. As a special case, if the header
+// exists in the Request.Header map but has a nil value (such as when
+// set by the Director func), the X-Forwarded-For header is
+// not modified.
+//
+// To prevent IP spoofing, be sure to delete any pre-existing
+// X-Forwarded-For header coming from the client or
+// an untrusted proxy.
 type ReverseProxy struct {
 	// Director must be a function which modifies
 	// the request into a new request to be sent
@@ -44,9 +58,9 @@ type ReverseProxy struct {
 	// A negative value means to flush immediately
 	// after each write to the client.
 	// The FlushInterval is ignored when ReverseProxy
-	// recognizes a response as a streaming response;
+	// recognizes a response as a streaming response, or
-	// for such responses, writes are flushed to the client
+	// if its ContentLength is -1; for such responses, writes
-	// immediately.
+	// are flushed to the client immediately.
 	FlushInterval time.Duration
 
 	// ErrorLog specifies an optional logger for errors
@@ -97,6 +111,27 @@ func singleJoiningSlash(a, b string) string {
 	return a + b
 }
 
+func joinURLPath(a, b *url.URL) (path, rawpath string) {
+	if a.RawPath == "" && b.RawPath == "" {
+		return singleJoiningSlash(a.Path, b.Path), ""
+	}
+	// Same as singleJoiningSlash, but uses EscapedPath to determine
+	// whether a slash should be added
+	apath := a.EscapedPath()
+	bpath := b.EscapedPath()
+
+	aslash := strings.HasSuffix(apath, "/")
+	bslash := strings.HasPrefix(bpath, "/")
+
+	switch {
+	case aslash && bslash:
+		return a.Path + b.Path[1:], apath + bpath[1:]
+	case !aslash && !bslash:
+		return a.Path + "/" + b.Path, apath + "/" + bpath
+	}
+	return a.Path + b.Path, apath + bpath
+}
+
 // NewSingleHostReverseProxy returns a new ReverseProxy that routes
 // URLs to the scheme, host, and base path provided in target. If the
 // target's path is "/base" and the incoming request was for "/dir",
@@ -109,7 +144,7 @@ func NewSingleHostReverseProxy(target *url.URL) *ReverseProxy {
 	director := func(req *http.Request) {
 		req.URL.Scheme = target.Scheme
 		req.URL.Host = target.Host
-		req.URL.Path = singleJoiningSlash(target.Path, req.URL.Path)
+		req.URL.Path, req.URL.RawPath = joinURLPath(target, req.URL)
 		if targetQuery == "" || req.URL.RawQuery == "" {
 			req.URL.RawQuery = targetQuery + req.URL.RawQuery
 		} else {
@@ -195,16 +230,19 @@ func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 		}()
 	}
 
-	outreq := req.WithContext(ctx)
+	outreq := req.Clone(ctx)
 	if req.ContentLength == 0 {
 		outreq.Body = nil // Issue 16036: nil Body for http.Transport retries
 	}
+	if outreq.Header == nil {
+		outreq.Header = make(http.Header) // Issue 33142: historical behavior was to always allocate
+	}
 
 	// =============================
 	// Modified for frp
-	outreq = outreq.WithContext(context.WithValue(outreq.Context(), RouteInfoURL, req.URL.Path))
+	outreq = outreq.Clone(context.WithValue(outreq.Context(), RouteInfoURL, req.URL.Path))
-	outreq = outreq.WithContext(context.WithValue(outreq.Context(), RouteInfoHost, req.Host))
+	outreq = outreq.Clone(context.WithValue(outreq.Context(), RouteInfoHost, req.Host))
-	outreq = outreq.WithContext(context.WithValue(outreq.Context(), RouteInfoRemote, req.RemoteAddr))
+	outreq = outreq.Clone(context.WithValue(outreq.Context(), RouteInfoRemote, req.RemoteAddr))
 	// =============================
 
 	p.Director(outreq)
@@ -244,10 +282,14 @@ func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 		// If we aren't the first proxy retain prior
 		// X-Forwarded-For information as a comma+space
 		// separated list and fold multiple headers into one.
-		if prior, ok := outreq.Header["X-Forwarded-For"]; ok {
+		prior, ok := outreq.Header["X-Forwarded-For"]
+		omit := ok && prior == nil // Issue 38079: nil now means don't populate the header
+		if len(prior) > 0 {
 			clientIP = strings.Join(prior, ", ") + ", " + clientIP
 		}
-		outreq.Header.Set("X-Forwarded-For", clientIP)
+		if !omit {
+			outreq.Header.Set("X-Forwarded-For", clientIP)
+		}
 	}
 
 	res, err := transport.RoundTrip(outreq)
@@ -290,7 +332,7 @@ func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 
 	rw.WriteHeader(res.StatusCode)
 
-	err = p.copyResponse(rw, res.Body, p.flushInterval(req, res))
+	err = p.copyResponse(rw, res.Body, p.flushInterval(res))
 	if err != nil {
 		defer res.Body.Close()
 		// Since we're streaming the response, if we run into an error all we can do
@@ -353,7 +395,7 @@ func shouldPanicOnCopyError(req *http.Request) bool {
 func removeConnectionHeaders(h http.Header) {
 	for _, f := range h["Connection"] {
 		for _, sf := range strings.Split(f, ",") {
-			if sf = strings.TrimSpace(sf); sf != "" {
+			if sf = textproto.TrimString(sf); sf != "" {
 				h.Del(sf)
 			}
 		}
@@ -362,7 +404,7 @@ func removeConnectionHeaders(h http.Header) {
 
 // flushInterval returns the p.FlushInterval value, conditionally
 // overriding its value for a specific request/response.
-func (p *ReverseProxy) flushInterval(req *http.Request, res *http.Response) time.Duration {
+func (p *ReverseProxy) flushInterval(res *http.Response) time.Duration {
 	resCT := res.Header.Get("Content-Type")
 
 	// For Server-Sent Events responses, flush immediately.
@@ -371,7 +413,11 @@ func (p *ReverseProxy) flushInterval(req *http.Request, res *http.Response) time
 		return -1 // negative means immediately
 	}
 
-	// TODO: more specific cases? e.g. res.ContentLength == -1?
+	// We might have the case of streaming for which Content-Length might be unset.
+	if res.ContentLength == -1 {
+		return -1
+	}
+
 	return p.FlushInterval
 }
 
@@ -510,8 +556,6 @@ func (p *ReverseProxy) handleUpgradeResponse(rw http.ResponseWriter, req *http.R
 		return
 	}
 
-	copyHeader(res.Header, rw.Header())
-
 	hj, ok := rw.(http.Hijacker)
 	if !ok {
 		p.getErrorHandler()(rw, req, fmt.Errorf("can't switch protocols using non-Hijacker ResponseWriter type %T", rw))
@@ -522,13 +566,30 @@ func (p *ReverseProxy) handleUpgradeResponse(rw http.ResponseWriter, req *http.R
 		p.getErrorHandler()(rw, req, fmt.Errorf("internal error: 101 switching protocols response with non-writable body"))
 		return
 	}
-	defer backConn.Close()
+
+	backConnCloseCh := make(chan bool)
+	go func() {
+		// Ensure that the cancelation of a request closes the backend.
+		// See issue https://golang.org/issue/35559.
+		select {
+		case <-req.Context().Done():
+		case <-backConnCloseCh:
+		}
+		backConn.Close()
+	}()
+
+	defer close(backConnCloseCh)
+
 	conn, brw, err := hj.Hijack()
 	if err != nil {
 		p.getErrorHandler()(rw, req, fmt.Errorf("Hijack failed on protocol switch: %v", err))
 		return
 	}
 	defer conn.Close()
+
+	copyHeader(rw.Header(), res.Header)
+
+	res.Header = rw.Header()
 	res.Body = nil // so res.Write only writes the headers; we have res.Body in backConn above
 	if err := res.Write(brw); err != nil {
 		p.getErrorHandler()(rw, req, fmt.Errorf("response write: %v", err))