What is error 400 redirect_uri_mismatch?

Error 400: redirect_uri_mismatch is a common Google OAuth error that means the URL your application is sending users back to (the redirect URI) doesn't exactly match any of the "Authorized redirect URIs" you've registered in your Google Cloud Project settings, causing Google to block the sign-in. It's a security measure, often fixed by precisely matching the URI in your app (including http vs. https, trailing slashes, ports, or case) with those listed in the Google Cloud Console.
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How to solve error 400 redirect_uri_mismatch?

Resolving 400 Redirect_uri_mismatch

First, you'll need to head over to the API console. Make sure you're on the right project; check in the top-left corner. Go to the Credentials tab and click on the Oauth Client Id you created. We will be focused on the Authorized redirect URIs section.
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How do I fix an HTTP 400 error?

How to Fix 400 Bad Request Error?
  1. Check the Submitted URL.
  2. Clear Browser Cache.
  3. Clear Browser Cookies.
  4. Check if File Upload Exceeds the Server Limit.
  5. Clear DNS Cache.
  6. Deactivate Browser Extensions.
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How to fix an OAuth error?

Resolving the Invalid OAuth Response Error
  1. Verify Client ID and Secret. Ensure that the client ID and secret provided by the authorization server are correct. ...
  2. Check Access Token Expiry. Check if the access token has expired. ...
  3. Confirm Redirect URI. ...
  4. Validate Scope. ...
  5. Troubleshoot Authorization Server Issues.
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How to solve redirect error?

To fix a redirect error, start by clearing your browser's cache/cookies and trying an incognito window; if that fails, it's likely a server-side issue, so check for redirect loops in your .htaccess, disable plugins (WordPress), ensure proper HTTPS/HTTP settings, and contact your host or developer to debug redirect chains and faulty links. 
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How the fix redirect_uri_mismatch error. #googledevelopers #googleoauth

What is error 400 trying to redirect?

The reason for a 400 response is typically due to malformed request syntax, invalid request message framing, or deceptive request routing. Clients that receive a 400 response should expect that repeating the request without modification will fail with the same error.
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How to eliminate redirects?

To get rid of redirects, adjust your browser's settings (Privacy & Security > Site Settings > Pop-ups and redirects) to block them, install a reputable ad/redirect blocker extension like uBlock Origin, clear your browser's cache/cookies, scan for malware, and remove suspicious programs or extensions causing the issue. 
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What does OAuth mean?

OAuth (Open Authorization) is a standard that lets you grant a website or app limited access to your data on another site (like Google or Facebook) without giving away your password, acting like a digital valet key for secure, delegated access to your info (photos, contacts, etc.). It uses temporary access tokens instead of your actual login, allowing seamless sign-ins and sharing (e.g., "Login with Google") while keeping your credentials private and secure.
 
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How to fix an authentication error?

To fix an authentication error, first try the quick fixes: sign out and back in, restart your device/router, and update everything (app, OS, drivers). If that fails, clear app/browser cache, reset network settings (Wi-Fi, Bluetooth), check account security (2FA, suspicious activity), and verify credentials/settings for the specific service. 
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How do I turn off OAuth?

Procedure
  1. Click Open Administration menu. > Users and Security > OAuth 2.0 Configuration.
  2. Select the checkbox in the row of the client you want to enable or disable.
  3. Choose one of the following options: Select Enable to enable a disabled client. Select Disable to disable an enabled client.
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How to clear error code 400?

Here's how to get rid of 400 Bad Request errors step by step:
  1. Check your internet connection. ...
  2. Fix typos and invalid characters in the URL. ...
  3. Clear your browser's cache and cookies. ...
  4. Deactivate browser extensions. ...
  5. Flush the DNS cache. ...
  6. Compress your files.
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Is a 400 error temporary?

Sometimes, a 400 error can be a temporary glitch. A simple page refresh can often resolve the issue. You can do this by pressing the F5 key on your keyboard or by clicking the refresh button in your browser's toolbar.
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What are common error 400 messages?

HTTP 400 Bad Request Error

This can happen because of an invalid URL, malformed syntax, and other reasons. Since there are so many potential causes for a bad request error, there are also a lot of fixes for it. For example, you can check for misspellings in the URL you typed, clear your cookies, or empty your cache.
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How do I fix HTTP Error 400?

To fix a 400 Bad Request, check for URL errors, clear your browser's cookies and cache, disable extensions, flush the DNS cache, reduce the request size, or review your server's configuration.
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What does Google OAuth return?

Your application then sends the token request to the Google OAuth 2.0 Authorization Server, which returns an access token. The application uses the token to access a Google API. When the token expires, the application repeats the process.
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How do I fix a Google authorization error?

How to fix the Google authentication error on any add-on
  1. Step 1: Sign out of all your accounts. Click the profile icon in the top right corner of your screen. All your Google accounts will be displayed in a drop-down list. ...
  2. Step 2: Sign in to the account you want to use. This will make that account the default account.
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Could a neighbor be using my Wi-Fi?

Can my neighbors use my WiFi without permission? If your network is unsecured or if your neighbors have your password, they can use your WiFi without permission. To avoid unauthorized access, make sure to use WPA3 encryption and use a strong, unique password.
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What causes authentication to fail?

For example, if a user tries to log in with a misspelled username or a wrong password, authentication will fail. Expired Passwords: Passwords that have expired cannot be used for authentication. Users need to reset their passwords to gain access.
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Can a VPN cause Wi-Fi issues?

VPNs can affect internet speed which is a key concern for users. Despite their ability to provide additional layers of privacy and security, VPNs can slow down internet connections when overloaded. This is due to latency, which is the amount of time between an action a user takes and the expected response.
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Is Gmail OAuth?

Starting March 14, 2025, you and your users must use OAuth with third-party apps to access Gmail, Google Calendar, and Google Contacts. OAuth is a more secure access method.
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Who uses OAuth?

Many companies use OAuth to simplify access to third-party apps and websites without divulging their users' passwords or sensitive data. Google, Amazon, Microsoft, Facebook, and Twitter all use it to share information about their accounts for a wide variety of purposes, including simplifying purchases.
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How to authenticate using OAuth?

In general, OAuth authentication follows a six step pattern:
  1. An application requests authorization on a user's behalf.
  2. The application obtains a Grant Token.
  3. The client requests an access token by using the Grant Token.
  4. The authorization server validates the Grant Token and issues an Access Token and a Refresh Token.
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What are malicious redirects?

A malicious redirect is code inserted into a website with the intent of redirecting the site visitor to another website. Malicious redirects are typically inserted into a website by attackers with the intent of generating advertising impressions. However, some malicious redirections can have more damaging effects.
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How do I delete a redirect virus?

To get rid of a redirect virus, first, run a full scan with good antivirus/anti-malware software (like Malwarebytes) and remove suspicious programs from your computer; then, reset your browser settings, clear cache/cookies, remove unwanted extensions/add-ons, and check your DNS settings and startup programs for any malicious entries. 
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What causes a website to redirect?

A website redirects to another due to intentional web management (like changing URLs or domains) or malicious activity (malware, hacks), using scripts, DNS changes, or server files like .htaccess to send users elsewhere for ad revenue, phishing, or malware delivery, often obfuscating the real source. If it's unwanted, it could be a compromised site, bad browser extension, or even a domain issue like expiration. 
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