diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 3a5eb5904f..bde50fc4b7 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -25,8 +25,8 @@ import (
 	"code.gitea.io/gitea/services/gitdiff"
 )
 
-// NewFuncMap returns functions for injecting to templates
-func NewFuncMap() template.FuncMap {
+// newFuncMapWebPage returns functions for injecting to templates
+func newFuncMapWebPage() template.FuncMap {
 	return map[string]any{
 		"DumpVar": dumpVar,
 		"NIL":     func() any { return nil },
@@ -40,7 +40,6 @@ func NewFuncMap() template.FuncMap {
 		"QueryEscape":  queryEscape,
 		"QueryBuild":   QueryBuild,
 		"SanitizeHTML": SanitizeHTML,
-		"DotEscape":    dotEscape,
 
 		"PathEscape":         url.PathEscape,
 		"PathEscapeSegments": util.PathEscapeSegments,
@@ -61,6 +60,7 @@ func NewFuncMap() template.FuncMap {
 
 		// -----------------------------------------------------------------
 		// time / number / format
+		"ShortSha": base.ShortSha,
 		"FileSize": base.FileSize,
 		"CountFmt": countFmt,
 		"Sec2Hour": util.SecToHours,
@@ -73,6 +73,7 @@ func NewFuncMap() template.FuncMap {
 
 		"AssetURI":     public.AssetURI,
 		"ScriptImport": scriptImport,
+
 		// -----------------------------------------------------------------
 		// setting
 		"AppName": func() string {
@@ -84,17 +85,10 @@ func NewFuncMap() template.FuncMap {
 		"AssetUrlPrefix": func() string {
 			return setting.StaticURLPrefix + "/assets"
 		},
-		"AppUrl": func() string {
-			// The usage of AppUrl should be avoided as much as possible,
-			// because the AppURL(ROOT_URL) may not match user's visiting site and the ROOT_URL in app.ini may be incorrect.
-			// And it's difficult for Gitea to guess absolute URL correctly with zero configuration,
-			// because Gitea doesn't know whether the scheme is HTTP or HTTPS unless the reverse proxy could tell Gitea.
-			return setting.AppURL
-		},
 		"AppVer": func() string {
 			return setting.AppVer
 		},
-		"AppDomain": func() string { // documented in mail-templates.md
+		"AppDomain": func() string { // TODO: helm char registry still uses it, need to use current host
 			return setting.Domain
 		},
 		"ShowFooterTemplateLoadTime": func() bool {
@@ -143,7 +137,6 @@ func NewFuncMap() template.FuncMap {
 
 		// -----------------------------------------------------------------
 		// misc (TODO: move them to MiscUtils to avoid bloating the main func map)
-		"ShortSha":                 base.ShortSha,
 		"ActionContent2Commits":    ActionContent2Commits,
 		"IsMultilineCommitMessage": isMultilineCommitMessage,
 		"CommentMustAsDiff":        gitdiff.CommentMustAsDiff,
diff --git a/modules/templates/mail.go b/modules/templates/mail.go
index ca13626468..b2be212b18 100644
--- a/modules/templates/mail.go
+++ b/modules/templates/mail.go
@@ -6,12 +6,14 @@ package templates
 import (
 	"html/template"
 	"io"
+	"net/url"
 	"regexp"
 	"slices"
 	"strings"
 	"sync"
 	texttmpl "text/template"
 
+	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/graceful"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -41,6 +43,7 @@ func mailSubjectTextFuncMap() texttmpl.FuncMap {
 		"Eval": evalTokens,
 
 		"EllipsisString": util.EllipsisDisplayString,
+
 		"AppName": func() string {
 			return setting.AppName
 		},
@@ -50,6 +53,48 @@ func mailSubjectTextFuncMap() texttmpl.FuncMap {
 	}
 }
 
+func mailBodyFuncMap() template.FuncMap {
+	// Some of them are documented in mail-templates.md
+	return template.FuncMap{
+		"DumpVar": dumpVar,
+		"NIL":     func() any { return nil },
+
+		// html/template related functions
+		"dict":         dict,
+		"Iif":          iif,
+		"Eval":         evalTokens,
+		"HTMLFormat":   htmlFormat,
+		"QueryEscape":  queryEscape,
+		"QueryBuild":   QueryBuild,
+		"SanitizeHTML": SanitizeHTML,
+
+		"PathEscape":         url.PathEscape,
+		"PathEscapeSegments": util.PathEscapeSegments,
+
+		"DotEscape": dotEscape,
+
+		// utils
+		"StringUtils": NewStringUtils,
+		"SliceUtils":  NewSliceUtils,
+		"JsonUtils":   NewJsonUtils,
+
+		// time / number / format
+		"ShortSha": base.ShortSha,
+		"FileSize": base.FileSize,
+
+		// setting
+		"AppName": func() string {
+			return setting.AppName
+		},
+		"AppUrl": func() string {
+			return setting.AppURL
+		},
+		"AppDomain": func() string {
+			return setting.Domain
+		},
+	}
+}
+
 var mailSubjectSplit = regexp.MustCompile(`(?m)^-{3,}\s*$`)
 
 func newMailRenderer() (*MailRender, error) {
@@ -103,7 +148,7 @@ func newMailRenderer() (*MailRender, error) {
 		return renderer.tmplRenderer.Templates().HasTemplate(name)
 	}
 
-	staticFuncMap := NewFuncMap()
+	staticFuncMap := mailBodyFuncMap()
 	renderer.BodyTemplates.ExecuteTemplate = func(w io.Writer, name string, data any) error {
 		if t, ok := renderer.mockedBodyTemplates[name]; ok {
 			return t.Execute(w, data)
@@ -131,7 +176,7 @@ func (r *MailRender) MockTemplate(name, subject, body string) func() {
 	texttmpl.Must(r.SubjectTemplates.New(name).Parse(subject))
 
 	oldBody, hasOldBody := r.mockedBodyTemplates[name]
-	mockFuncMap := NewFuncMap()
+	mockFuncMap := mailBodyFuncMap()
 	r.mockedBodyTemplates[name] = template.Must(template.New(name).Funcs(mockFuncMap).Parse(body))
 	return func() {
 		r.SubjectTemplates = oldSubject
diff --git a/modules/templates/page.go b/modules/templates/page.go
index 8f6c82fc4b..32e52bb68e 100644
--- a/modules/templates/page.go
+++ b/modules/templates/page.go
@@ -24,13 +24,13 @@ type pageRenderer struct {
 }
 
 func (r *pageRenderer) funcMap(ctx context.Context) template.FuncMap {
-	pageFuncMap := NewFuncMap()
+	pageFuncMap := newFuncMapWebPage()
 	pageFuncMap["ctx"] = func() any { return ctx }
 	return pageFuncMap
 }
 
 func (r *pageRenderer) funcMapDummy() template.FuncMap {
-	dummyFuncMap := NewFuncMap()
+	dummyFuncMap := newFuncMapWebPage()
 	dummyFuncMap["ctx"] = func() any { return nil } // for template compilation only, no context available
 	return dummyFuncMap
 }
diff --git a/options/locale/locale_en-US.json b/options/locale/locale_en-US.json
index e796064ce3..c7b77e5724 100644
--- a/options/locale/locale_en-US.json
+++ b/options/locale/locale_en-US.json
@@ -3223,10 +3223,8 @@
   "admin.config.server_config": "Server Configuration",
   "admin.config.app_name": "Site Title",
   "admin.config.app_ver": "Gitea Version",
-  "admin.config.app_url": "Gitea Base URL",
   "admin.config.custom_conf": "Configuration File Path",
   "admin.config.custom_file_root_path": "Custom File Root Path",
-  "admin.config.domain": "Server Domain",
   "admin.config.disable_router_log": "Disable Router Log",
   "admin.config.run_user": "Run As Username",
   "admin.config.run_mode": "Run Mode",
diff --git a/routers/web/admin/config.go b/routers/web/admin/config.go
index a449796ec1..bf48e554df 100644
--- a/routers/web/admin/config.go
+++ b/routers/web/admin/config.go
@@ -123,9 +123,7 @@ func Config(ctx *context.Context) {
 	ctx.Data["PageIsAdminConfigSummary"] = true
 
 	ctx.Data["CustomConf"] = setting.CustomConf
-	ctx.Data["AppUrl"] = setting.AppURL
 	ctx.Data["AppBuiltWith"] = setting.AppBuiltWith
-	ctx.Data["Domain"] = setting.Domain
 	ctx.Data["RunUser"] = setting.RunUser
 	ctx.Data["RunMode"] = util.ToTitleCase(setting.RunMode)
 	ctx.Data["GitVersion"] = git.DefaultFeatures().VersionInfo()
diff --git a/services/context/context_template.go b/services/context/context_template.go
index 52c7461187..8fce301ca7 100644
--- a/services/context/context_template.go
+++ b/services/context/context_template.go
@@ -5,10 +5,13 @@ package context
 
 import (
 	"context"
+	"html/template"
 	"net/http"
 	"strconv"
+	"strings"
 	"time"
 
+	"code.gitea.io/gitea/modules/httplib"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web/middleware"
 	"code.gitea.io/gitea/services/webtheme"
@@ -69,3 +72,9 @@ func (c TemplateContext) CurrentWebBanner() *setting.WebBannerType {
 	}
 	return nil
 }
+
+func (c TemplateContext) MakeAppURL(link string) template.URL {
+	s := httplib.GuessCurrentAppURL(c.parentContext())
+	s = strings.TrimSuffix(s, "/")
+	return template.URL(s + strings.TrimPrefix(link, "/"))
+}
diff --git a/templates/admin/config.tmpl b/templates/admin/config.tmpl
index 6dc6e0d5ea..b68f2c1a7a 100644
--- a/templates/admin/config.tmpl
+++ b/templates/admin/config.tmpl
@@ -11,10 +11,6 @@
 				<dd>{{AppVer}}{{.AppBuiltWith}}</dd>
 				<dt>{{ctx.Locale.Tr "admin.config.custom_conf"}}</dt>
 				<dd>{{.CustomConf}}</dd>
-				<dt>{{ctx.Locale.Tr "admin.config.app_url"}}</dt>
-				<dd>{{.AppUrl}}</dd>
-				<dt>{{ctx.Locale.Tr "admin.config.domain"}}</dt>
-				<dd>{{.Domain}}</dd>
 				<dt>{{ctx.Locale.Tr "admin.config.disable_router_log"}}</dt>
 				<dd>{{svg (Iif .DisableRouterLog "octicon-check" "octicon-x")}}</dd>
 
diff --git a/templates/base/head_opengraph.tmpl b/templates/base/head_opengraph.tmpl
index cb96fb6d6d..5040e8e53d 100644
--- a/templates/base/head_opengraph.tmpl
+++ b/templates/base/head_opengraph.tmpl
@@ -16,7 +16,7 @@
 		{{end}}
 	{{else if or .PageIsDiff .IsViewFile}}
 		<meta property="og:title" content="{{.Title}}">
-		<meta property="og:url" content="{{AppUrl}}{{.Link}}">
+		<meta property="og:url" content="{{ctx.MakeAppURL $.Link}}">
 		{{if and .PageIsDiff .Commit}}
 			{{- $commitMessageParts := StringUtils.Cut .Commit.Message "\n" -}}
 			{{- $commitMessageBody := index $commitMessageParts 1 -}}
@@ -41,7 +41,7 @@
 	<meta property="og:title" content="{{AppName}}">
 	<meta property="og:type" content="website">
 	<meta property="og:image" content="{{AssetUrlPrefix}}/img/logo.png">
-	<meta property="og:url" content="{{AppUrl}}">
+	<meta property="og:url" content="{{ctx.MakeAppURL ""}}">
 	<meta property="og:description" content="{{MetaDescription}}">
 {{end}}
 <meta property="og:site_name" content="{{AppName}}">
diff --git a/templates/base/head_script.tmpl b/templates/base/head_script.tmpl
index 403417892f..f03f62215b 100644
--- a/templates/base/head_script.tmpl
+++ b/templates/base/head_script.tmpl
@@ -7,7 +7,7 @@ If you introduce mistakes in it, Gitea JavaScript code wouldn't run correctly.
 	window.addEventListener('error', function(e) {window._globalHandlerErrors=window._globalHandlerErrors||[]; window._globalHandlerErrors.push(e);});
 	window.addEventListener('unhandledrejection', function(e) {window._globalHandlerErrors=window._globalHandlerErrors||[]; window._globalHandlerErrors.push(e);});
 	window.config = {
-		appUrl: '{{AppUrl}}',
+		appUrl: '{{ctx.MakeAppURL ""}}',
 		appSubUrl: '{{AppSubUrl}}',
 		assetUrlPrefix: '{{AssetUrlPrefix}}',
 		runModeIsProd: {{.RunModeIsProd}},