# HTTP Status Codes


![google-404-error-page-1.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1631101800049/yRbZ6I-gn.png)
## Have you ever come across “Error 404: Page Not Found.” and wondered what this 404 is? So this is an HTTP Response Status Code.

### What is an HTTP Response Status Code?
HTTP Response Status Code is response status sent by the server in reply to the request sent by a web browser.

### Why do we use HTTP Status Code?
HTTP Status Code lets us know whether a specific request has been successfully completed or not.

## HTTP Status Codes are categorized into five types:
1. Informational Responses(100-199)
2. Successful Responses (200–299)
3. Redirects (300–399)
4. Client Errors (400–499)
5. Server Errors (500–599)

### Let us look at the most common HTTP Status Codes that we encounter.

### 2XX(Success)
**200 (OK):** The request was fulfilled.

**201 (Created):** The request has succeeded and a new resource has been created.

**204 (No Response):** Server has received the request but has no information to send back.

### 4XX, 5XX(Errors)
**4XX** are generally where clients err.

**400 (Bad Request):** The server couldn't understand the request due to invalid syntax.

**403 (Forbidden):** The request is for something forbidden i.e the client does not have access to that content.

**404 (Not Found):(The most common one)** The server has not found anything matching the URI given.

**5XX** are generally where the server knows that the server has erred.

**500 (Internal Server Error):** This means that the server encountered a situation and the server doesn't know how to handle it.

**502 (Bad Gateway):** This means that the server got an invalid response while working as a gateway.

**503 (Service Unavailable):** This means that the server cannot handle any requests at the moment. The reason for this can be the maintenance of the server or the server is down.

**504 (Timeout):** This means that the server has not received any response int time while acting as a gateway.