diff --git a/index.html b/index.html
index c835634..972841a 100644
--- a/index.html
+++ b/index.html
@@ -15,9 +15,12 @@
             }
         </script>
         <script type="module">
-            import { DPoPTokenProvider, ReactiveFetchManager } from "./dist/mod.js"
+            import { DPoPTokenProvider, InsecureConfiguration, ReactiveFetchManager } from "./dist/mod.js"
             import "./dist/registerElements.js"
 
+            /* Demo talks to a local Community Solid Server over plain HTTP */
+            InsecureConfiguration.allow()
+
             /* Reactive fetch infrastructure */
             const ui = document.querySelector("authorization-code-flow")
             const issuerUi = document.querySelector("idp-picker")
diff --git a/src/BearerTokenProvider.ts b/src/BearerTokenProvider.ts
index 051af48..6e98225 100644
--- a/src/BearerTokenProvider.ts
+++ b/src/BearerTokenProvider.ts
@@ -1,9 +1,7 @@
 import * as oauth from "oauth4webapi"
 import { GetCodeCallback } from "./GetCodeCallback.js"
 import { TokenProvider } from "./TokenProvider.js"
-
-// TODO: Configure properly for insecure localhost only
-const oauthAllowInsecureRequests = true
+import { InsecureConfiguration } from "./InsecureConfiguration.js"
 
 export class BearerTokenProvider implements TokenProvider {
     readonly #getCode: GetCodeCallback
@@ -43,12 +41,12 @@ export class BearerTokenProvider implements TokenProvider {
     async upgrade(request: Request): Promise<Request> {
         const issuer = await this.#getIssuer(request)
 
-        const discoveryResponse = await oauth.discoveryRequest(issuer, {[oauth.allowInsecureRequests]: oauthAllowInsecureRequests})
+        const discoveryResponse = await oauth.discoveryRequest(issuer, InsecureConfiguration.requestOptions)
         const authorizationServer = await oauth.processDiscoveryResponse(issuer, discoveryResponse)
 
         const callbackUri = await this.#getCallback(request)
 
-        const registrationResponse = await oauth.dynamicClientRegistrationRequest(authorizationServer, {redirect_uris: [callbackUri]}, {[oauth.allowInsecureRequests]: oauthAllowInsecureRequests})
+        const registrationResponse = await oauth.dynamicClientRegistrationRequest(authorizationServer, {redirect_uris: [callbackUri]}, InsecureConfiguration.requestOptions)
         const clientRegistration = await oauth.processDynamicClientRegistrationResponse(registrationResponse)
         const [registeredRedirectUri] = clientRegistration.redirect_uris as string[]
         const [registeredResponseType] = clientRegistration.response_types as string[]
@@ -84,7 +82,7 @@ export class BearerTokenProvider implements TokenProvider {
             clientAuth = authenticationMethod(clientSecret)
         }
 
-        const tokenResponse = await oauth.authorizationCodeGrantRequest(authorizationServer, clientRegistration, clientAuth, authorizationCodeParams, callbackUri, codeVerifier, {[oauth.allowInsecureRequests]: oauthAllowInsecureRequests})
+        const tokenResponse = await oauth.authorizationCodeGrantRequest(authorizationServer, clientRegistration, clientAuth, authorizationCodeParams, callbackUri, codeVerifier, InsecureConfiguration.requestOptions)
 
         // jwt nonce missing in igrant
         // const tokenResult = await oauth.processAuthorizationCodeResponse(authorizationServer, clientRegistration, tokenResponse, {expectedNonce: nonce})
diff --git a/src/ClientCredentialsTokenProvider.ts b/src/ClientCredentialsTokenProvider.ts
index 2bc32b5..1b7644a 100644
--- a/src/ClientCredentialsTokenProvider.ts
+++ b/src/ClientCredentialsTokenProvider.ts
@@ -2,6 +2,7 @@ import * as oauth from "oauth4webapi"
 import { AuthorizationServer } from "oauth4webapi"
 import * as DPoP from "dpop"
 import type { TokenProvider } from "./TokenProvider.js"
+import { InsecureConfiguration } from "./InsecureConfiguration.js"
 
 export class ClientCredentialsTokenProvider implements TokenProvider {
     constructor(private clientId: string, private clientSecret: string) {
@@ -35,7 +36,8 @@ export class ClientCredentialsTokenProvider implements TokenProvider {
         const issuer = await this.#getIssuer(request)
 
         const discoveryResponse = await oauth.discoveryRequest(issuer, {
-            signal: request.signal
+            signal: request.signal,
+            ...InsecureConfiguration.requestOptions
         })
         const authorizationServer = await oauth.processDiscoveryResponse(issuer, discoveryResponse)
 
@@ -46,7 +48,8 @@ export class ClientCredentialsTokenProvider implements TokenProvider {
 
         const tokenResponse = await oauth.clientCredentialsGrantRequest(authorizationServer, clientRegistration, this.getClientAuth(authorizationServer, clientRegistration), {scope: "webid"}, {
             DPoP: dpop,
-            signal: request.signal
+            signal: request.signal,
+            ...InsecureConfiguration.requestOptions
         })
 
         const tokenResult = await oauth.processClientCredentialsResponse(authorizationServer, clientRegistration, tokenResponse)
diff --git a/src/DPoPTokenProvider.ts b/src/DPoPTokenProvider.ts
index 4760ae2..f5108d4 100644
--- a/src/DPoPTokenProvider.ts
+++ b/src/DPoPTokenProvider.ts
@@ -3,6 +3,7 @@ import * as DPoP from "dpop"
 import type { GetCodeCallback } from "./GetCodeCallback.js"
 import type { TokenProvider } from "./TokenProvider.js"
 import type { GetIssuerCallback } from "./GetIssuerCallback.js"
+import { InsecureConfiguration } from "./InsecureConfiguration.js"
 
 export class DPoPTokenProvider implements TokenProvider {
     readonly #getCode: GetCodeCallback
@@ -22,10 +23,10 @@ export class DPoPTokenProvider implements TokenProvider {
     async upgrade(request: Request): Promise<Request> {
         const issuer = await this.#getIssuer(request)
 
-        const discoveryResponse = await oauth.discoveryRequest(issuer, {signal: request.signal})
+        const discoveryResponse = await oauth.discoveryRequest(issuer, {signal: request.signal, ...InsecureConfiguration.requestOptions})
         const authorizationServer = await oauth.processDiscoveryResponse(issuer, discoveryResponse)
 
-        const registrationResponse = await oauth.dynamicClientRegistrationRequest(authorizationServer, {redirect_uris: [this.#callbackUri]}, {signal: request.signal})
+        const registrationResponse = await oauth.dynamicClientRegistrationRequest(authorizationServer, {redirect_uris: [this.#callbackUri]}, {signal: request.signal, ...InsecureConfiguration.requestOptions})
         const clientRegistration = await oauth.processDynamicClientRegistrationResponse(registrationResponse)
         const [registeredRedirectUri] = clientRegistration.redirect_uris as string[]
         const [registeredResponseType] = clientRegistration.response_types as string[]
@@ -79,7 +80,7 @@ export class DPoPTokenProvider implements TokenProvider {
             }
         }
 
-        const tokenResponse = await oauth.authorizationCodeGrantRequest(authorizationServer, clientRegistration, this.getClientAuth(authorizationServer.issuer, clientRegistration), authorizationCodeParams, this.#callbackUri, authorizationServer.code_challenge_methods_supported !== undefined ? codeVerifier : oauth.nopkce, {DPoP: dpop, signal: request.signal})
+        const tokenResponse = await oauth.authorizationCodeGrantRequest(authorizationServer, clientRegistration, this.getClientAuth(authorizationServer.issuer, clientRegistration), authorizationCodeParams, this.#callbackUri, authorizationServer.code_challenge_methods_supported !== undefined ? codeVerifier : oauth.nopkce, {DPoP: dpop, signal: request.signal, ...InsecureConfiguration.requestOptions})
 
         const tokenResult = await oauth.processAuthorizationCodeResponse(authorizationServer, clientRegistration, tokenResponse, {expectedNonce: this.nonceVerificationOverride(authorizationServer.issuer, nonce)})
 
diff --git a/src/InsecureConfiguration.ts b/src/InsecureConfiguration.ts
new file mode 100644
index 0000000..1d46b86
--- /dev/null
+++ b/src/InsecureConfiguration.ts
@@ -0,0 +1,29 @@
+import * as oauth from "oauth4webapi"
+
+/**
+ * Global opt-in switch for oauth4webapi's HTTPS enforcement.
+ *
+ * @remarks
+ * Enforcement is on by default. Consumers targeting a plain HTTP issuer, such as a
+ * Community Solid Server on `http://localhost:3000`, opt out for themselves.
+ */
+export class InsecureConfiguration {
+    static #allowed = false
+
+    /**
+     * Allows OAuth requests over plain HTTP.
+     *
+     * @remarks
+     * Deprecated on purpose, so that consumers see the security implication at the call site.
+     *
+     * @deprecated Only ever call this in local development.
+     */
+    static allow() {
+        console.error("Insecure requests allowed for oauth4webapi")
+        this.#allowed = true
+    }
+
+    static get requestOptions(): {[oauth.allowInsecureRequests]?: boolean} {
+        return {[oauth.allowInsecureRequests]: this.#allowed}
+    }
+}
diff --git a/src/mod.ts b/src/mod.ts
index 0342cf6..7ddf99f 100644
--- a/src/mod.ts
+++ b/src/mod.ts
@@ -14,3 +14,4 @@ export * from "./IdpPicker.js"
 export * from "./WebIdPicker.js"
 export * from "./WebIdRequestCancelledError.js"
 export * from "./IssuerRequestCancelledError.js"
+export * from "./InsecureConfiguration.js"