<blockquote>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status">HTTP response status codes</a> are three-digit numbers sent by a server to indicate the outcome of a client's request made to a web server. They provide information about whether the request was successful, encountered an error, or requires further action from the client.</p>
</blockquote>
<p>These status codes are an essential part of the HTTP protocol, helping both clients and servers communicate effectively about the outcome of requests and any necessary actions to be taken.</p>
<hr />
<h2>1xx - Informational</h2>
<p>These are provisional responses indicating that the server has received the request and is continuing to process it.</p>
<ul>
<li><code>100 Continue</code>: The server has received the initial part of the request, and the client can proceed to send the request body, if applicable.</li>
</ul>
<hr />
<h2>2xx - Success</h2>
<p>These codes indicate that the request was successfully received, understood, and processed by the server.</p>
<ul>
<li><code>200 OK</code>: The request was successful, and the server has returned the requested resource.</li>
<li><code>201 Created</code>: The request has led to the creation of a new resource on the server.</li>
<li><code>204 No Content</code>: The request was successful, but there is no data to send back in the response body.</li>
</ul>
<hr />
<h2>3xx - Redirection</h2>
<p>These codes indicate that further action is required by the client to fulfill the request. The client may need to follow a redirect.</p>
<ul>
<li><code>301 Moved Permanently</code>: The requested resource has been permanently moved to a different URL.</li>
<li><code>302 Found (or 307 Temporary Redirect)</code>: The requested resource has been temporarily moved to a different URL.</li>
<li><code>304 Not Modified</code>: The client's cached copy of the resource is still valid, and there is no need to download it again.</li>
</ul>
<hr />
<h2>4xx - Client Errors</h2>
<p>These codes indicate that the client has made an error in the request.</p>
<ul>
<li><code>400 Bad Request</code>: The server cannot understand or process the client's request due to malformed syntax or other issues.</li>
<li><code>401 Unauthorized</code>: Authentication is required to access the resource.</li>
<li><code>403 Forbidden</code>: The server understood the request, but it refuses to fulfill it, often due to insufficient permissions.</li>
<li><code>404 Not Found</code>: The requested resource does not exist on the server.</li>
</ul>
<hr />
<h2>5xx - Server Errors</h2>
<p>These codes indicate that the server encountered an error or is otherwise incapable of performing the request.</p>
<ul>
<li><code>500 Internal Server Error</code>: A generic error message indicating that something went wrong on the server.</li>
<li><code>502 Bad Gateway</code>: The server, while acting as a gateway or proxy, received an invalid response from the upstream server.</li>
<li><code>503 Service Unavailable</code>: The server is temporarily unavailable due to overload or maintenance.</li>
</ul>

HTTP status codes explained

You need to understand meaning of common status code. In case you are not sure, refer to this MDN article and remember it.…