❌HTTP Codes and Methods

HTTP Error Codes

HTTP error codes are standard response status codes used by web servers to indicate the outcome of a client's request. These codes are grouped into different categories, including informational, success, redirection, client errors, and server errors.

1xx (Informational Responses)

Code	Description
100 Continue	The request has been received, and the server is waiting for the continuation of the request.
101 Switching Protocols	The server agrees to switch the protocol as requested by the client.

2xx (Success Responses)

Code	Description
200 OK	The request has been successfully processed.
201 Created	The request resulted in the creation of a new resource.
204 No Content	The request was successful, but the response contains no content.
206 Partial Content	The response contains only a portion of the requested data.

3xx (Redirection)

Code	Description
300 Multiple Choices	There are multiple options available for the resource the client can access.
301 Moved Permanently	The requested resource has been permanently moved to a new URL.
302 Found	The requested resource is temporarily located at a different URL.
304 Not Modified	The resource has not been modified since the last request.
307 Temporary Redirect	The requested resource is temporarily located at a different URL, and the client should retain the original request method.

4xx (Client Errors)

Code	Description
400 Bad Request	The client's request is incorrect or badly formed.
401 Unauthorized	The client is not authenticated.
403 Forbidden	The client lacks permission to access the requested resource.
404 Not Found	The requested resource could not be found on the server.
405 Method Not Allowed	The request method is not allowed for the resource.
406 Not Acceptable	The server cannot provide a response matching the list of acceptable media types.
407 Proxy Authentication Required	The client must authenticate with a proxy.
408 Request Timeout	The client's request has timed out.
409 Conflict	There is a conflict with the current state of the resource.
429 Too Many Requests	The client has exceeded the rate limits for requests.

5xx (Server Errors)

Code	Description
500 Internal Server Error	An internal server error has occurred.
501 Not Implemented	The server does not support the requested functionality.
502 Bad Gateway	The server acts as a gateway and has received an invalid response from an upstream server.
503 Service Unavailable	The server is temporarily unavailable, often due to overloading or maintenance.
504 Gateway Timeout	The server acts as a gateway and did not receive a timely response from an upstream server.
505 HTTP Version Not Supported	The server does not support the HTTP protocol version used in the request.
507 Insufficient Storage	The server cannot create the resource due to insufficient storage space.
511 Network Authentication Required	The client must authenticate to access the network or resource.

HTTP Methods

HTTP (Hypertext Transfer Protocol) defines a set of request methods to indicate the desired action to be performed for a given resource. These methods play a crucial role in shaping the communication between clients and servers in web applications. Here's an overview of some commonly used HTTP methods.

Method	Descriptions
HTTP GET	This retrieves a resource from the server. It is idempotent. Multiple identical requests return the same result.
HTTP PUT	This updates or creates a resource. It is idempotent. Multiple identical requests will update the same resource.
HTTP POST	This is used to create new resources. It is not idempotent, making two identical POST requests will duplicate the resource creation.
HTTP DELETE	This is used to delete a resource. It is idempotent. Multiple identical requests will delete the same resource.
HTTP PATCH	The PATCH method applies partial modifications to a resource.
HTTP HEAD	The HEAD method asks for a response identical to a GET request but without the response body.
HTTP CONNECT	The CONNECT method establishes a tunnel to the server identified by the target resource.
HTTP OPTIONS	This describes the communication options for the target resource.
HTTP TRACE	This performs a message loop-back test along the path to the target resource.

Use this cheat sheet to quickly reference and understand the meaning of HTTP error codes and methods.