diff --git a/packages/docusaurus-plugin-content-blog/src/pluginOptionSchema.ts b/packages/docusaurus-plugin-content-blog/src/pluginOptionSchema.ts
index 757a50b02657..d3605c1d97ef 100644
--- a/packages/docusaurus-plugin-content-blog/src/pluginOptionSchema.ts
+++ b/packages/docusaurus-plugin-content-blog/src/pluginOptionSchema.ts
@@ -10,6 +10,7 @@ import {
   RemarkPluginsSchema,
   RehypePluginsSchema,
   AdmonitionsSchema,
+  URISchema,
 } from '@docusaurus/utils-validation';
 
 export const DEFAULT_OPTIONS = {
@@ -55,7 +56,7 @@ export const PluginOptionSchema = Joi.object({
   remarkPlugins: RemarkPluginsSchema.default(DEFAULT_OPTIONS.remarkPlugins),
   rehypePlugins: RehypePluginsSchema.default(DEFAULT_OPTIONS.rehypePlugins),
   admonitions: AdmonitionsSchema.default(DEFAULT_OPTIONS.admonitions),
-  editUrl: Joi.string().uri(),
+  editUrl: URISchema,
   truncateMarker: Joi.object().default(DEFAULT_OPTIONS.truncateMarker),
   beforeDefaultRemarkPlugins: Joi.array()
     .items(
diff --git a/packages/docusaurus-plugin-content-docs/src/pluginOptionSchema.ts b/packages/docusaurus-plugin-content-docs/src/pluginOptionSchema.ts
index e72783e73f51..0c4eb0bf2c0e 100644
--- a/packages/docusaurus-plugin-content-docs/src/pluginOptionSchema.ts
+++ b/packages/docusaurus-plugin-content-docs/src/pluginOptionSchema.ts
@@ -10,6 +10,7 @@ import {
   RemarkPluginsSchema,
   RehypePluginsSchema,
   AdmonitionsSchema,
+  URISchema,
 } from '@docusaurus/utils-validation';
 
 const REVERSED_DOCS_HOME_PAGE_ID = '_index';
@@ -33,7 +34,7 @@ export const DEFAULT_OPTIONS: PluginOptions = {
 
 export const PluginOptionSchema = Joi.object({
   path: Joi.string().default(DEFAULT_OPTIONS.path),
-  editUrl: Joi.string().uri(),
+  editUrl: URISchema,
   routeBasePath: Joi.string().allow('').default(DEFAULT_OPTIONS.routeBasePath),
   homePageId: Joi.string().default(DEFAULT_OPTIONS.homePageId),
   include: Joi.array().items(Joi.string()).default(DEFAULT_OPTIONS.include),
diff --git a/packages/docusaurus-theme-classic/package.json b/packages/docusaurus-theme-classic/package.json
index 15fcbe1f43c0..0eb68a49b41d 100644
--- a/packages/docusaurus-theme-classic/package.json
+++ b/packages/docusaurus-theme-classic/package.json
@@ -26,7 +26,8 @@
     "prismjs": "^1.20.0",
     "prop-types": "^15.7.2",
     "react-router-dom": "^5.1.2",
-    "react-toggle": "^4.1.1"
+    "react-toggle": "^4.1.1",
+    "@docusaurus/utils-validation": "^2.0.0-alpha.61"
   },
   "devDependencies": {
     "@docusaurus/module-type-aliases": "^2.0.0-alpha.61",
diff --git a/packages/docusaurus-theme-classic/src/validateThemeConfig.js b/packages/docusaurus-theme-classic/src/validateThemeConfig.js
index 7f28d1e64c28..1267db7c56dc 100644
--- a/packages/docusaurus-theme-classic/src/validateThemeConfig.js
+++ b/packages/docusaurus-theme-classic/src/validateThemeConfig.js
@@ -6,6 +6,7 @@
  */
 
 const Joi = require('@hapi/joi');
+const {URISchema} = require('@docusaurus/utils-validation');
 
 const DEFAULT_COLOR_MODE_CONFIG = {
   defaultMode: 'light',
@@ -28,7 +29,7 @@ const NavbarItemPosition = Joi.string().equal('left', 'right').default('left');
 const DefaultNavbarItemSchema = Joi.object({
   items: Joi.array().optional().items(Joi.link('...')),
   to: Joi.string(),
-  href: Joi.string().uri(),
+  href: URISchema,
   label: Joi.string(),
   position: NavbarItemPosition,
   activeBasePath: Joi.string(),
@@ -140,7 +141,7 @@ const ColorModeSchema = Joi.object({
 
 const FooterLinkItemSchema = Joi.object({
   to: Joi.string(),
-  href: Joi.string().uri(),
+  href: URISchema,
   html: Joi.string(),
   label: Joi.string(),
 })
diff --git a/packages/docusaurus-utils-validation/src/__tests__/__snapshots__/validationSchemas.test.ts.snap b/packages/docusaurus-utils-validation/src/__tests__/__snapshots__/validationSchemas.test.ts.snap
index ff5d78809419..16ec0a6e8a0e 100644
--- a/packages/docusaurus-utils-validation/src/__tests__/__snapshots__/validationSchemas.test.ts.snap
+++ b/packages/docusaurus-utils-validation/src/__tests__/__snapshots__/validationSchemas.test.ts.snap
@@ -59,3 +59,5 @@ exports[`validation schemas RemarkPluginsSchema: for value=3 1`] = `"\\"value\\"
 exports[`validation schemas RemarkPluginsSchema: for value=false 1`] = `"\\"value\\" must be an array"`;
 
 exports[`validation schemas RemarkPluginsSchema: for value=null 1`] = `"\\"value\\" must be an array"`;
+
+exports[`validation schemas URISchema: for value="invalidURL" 1`] = `"\\"value\\" does not match any of the allowed types"`;
diff --git a/packages/docusaurus-utils-validation/src/__tests__/validationSchemas.test.ts b/packages/docusaurus-utils-validation/src/__tests__/validationSchemas.test.ts
index 05a614bd0d3e..4045a838e070 100644
--- a/packages/docusaurus-utils-validation/src/__tests__/validationSchemas.test.ts
+++ b/packages/docusaurus-utils-validation/src/__tests__/validationSchemas.test.ts
@@ -12,6 +12,7 @@ import {
   RehypePluginsSchema,
   RemarkPluginsSchema,
   PluginIdSchema,
+  URISchema,
 } from '../validationSchemas';
 
 function createTestHelpers({
@@ -106,4 +107,16 @@ describe('validation schemas', () => {
   test('RehypePluginsSchema', () => {
     testMarkdownPluginSchemas(RehypePluginsSchema);
   });
+
+  test('URISchema', () => {
+    const validURL = 'https://docusaurus.io';
+    const doubleHash = 'https://docusaurus.io#github#/:';
+    const invalidURL = 'invalidURL';
+    const urlFromIssue = 'https://riot.im/app/#/room/#ligo-public:matrix.org';
+    const {testFail, testOK} = createTestHelpers({schema: URISchema});
+    testOK(validURL);
+    testOK(doubleHash);
+    testFail(invalidURL);
+    testOK(urlFromIssue);
+  });
 });
diff --git a/packages/docusaurus-utils-validation/src/validationSchemas.ts b/packages/docusaurus-utils-validation/src/validationSchemas.ts
index 70f6925e9e78..d6ffd6d6928a 100644
--- a/packages/docusaurus-utils-validation/src/validationSchemas.ts
+++ b/packages/docusaurus-utils-validation/src/validationSchemas.ts
@@ -25,3 +25,19 @@ export const RemarkPluginsSchema = MarkdownPluginsSchema;
 export const RehypePluginsSchema = MarkdownPluginsSchema;
 
 export const AdmonitionsSchema = Joi.object().default({});
+
+export const URISchema = Joi.alternatives(
+  Joi.string().uri(),
+  Joi.custom((val, helpers) => {
+    try {
+      const url = new URL(val);
+      if (url) {
+        return val;
+      } else {
+        return helpers.error('any.invalid');
+      }
+    } catch {
+      return helpers.error('any.invalid');
+    }
+  }),
+);
diff --git a/packages/docusaurus/package.json b/packages/docusaurus/package.json
index 12a3e0561df7..67f803841c8b 100644
--- a/packages/docusaurus/package.json
+++ b/packages/docusaurus/package.json
@@ -107,7 +107,8 @@
     "webpack-bundle-analyzer": "^3.6.1",
     "webpack-dev-server": "^3.11.0",
     "webpack-merge": "^4.2.2",
-    "webpackbar": "^4.0.0"
+    "webpackbar": "^4.0.0",
+    "@docusaurus/utils-validation": "^2.0.0-alpha.61"
   },
   "peerDependencies": {
     "react": "^16.8.4",
diff --git a/packages/docusaurus/src/server/configValidation.ts b/packages/docusaurus/src/server/configValidation.ts
index 229443211769..cf5b5ad42a5a 100644
--- a/packages/docusaurus/src/server/configValidation.ts
+++ b/packages/docusaurus/src/server/configValidation.ts
@@ -11,6 +11,7 @@ import Joi from '@hapi/joi';
 import {
   logValidationBugReportHint,
   isValidationDisabledEscapeHatch,
+  URISchema,
 } from '@docusaurus/utils-validation';
 
 export const DEFAULT_CONFIG: Pick<
@@ -55,7 +56,7 @@ const ConfigSchema = Joi.object({
     .message('{{#label}} must be a string with a trailing `/`'),
   favicon: Joi.string().required(),
   title: Joi.string().required(),
-  url: Joi.string().uri().required(),
+  url: URISchema.required(),
   onBrokenLinks: Joi.string()
     .equal('ignore', 'log', 'warn', 'error', 'throw')
     .default(DEFAULT_CONFIG.onBrokenLinks),