Common HTTP Error Codes & Troubleshooting

Whenever you access an application over the internet or intranet, every HTTP request sent to a server gets a response with a status code. These codes are three-digit numbers grouped into different classes:

• 1xx (Informational) ℹ️
• 2xx (Success) ✅
• 3xx (Redirection) 🔄
• 4xx (Client Error) ❌
• 5xx (Server Error) ⚠️

The first digit of a status code quickly identifies its class. This article focuses on the most commonly encountered HTTP error codes - mainly 4xx and 5xx codes - and tips for troubleshooting them. 🔧

⚡ Common HTTP Error Codes​

S.No	Status Code	Name
1	400	Bad Request 🚫
2	401	Authorization Required 🔑
3	402	Payment Required 💳
4	403	Forbidden 🚷
5	404	Not Found 🔍
6	405	Method Not Allowed ❌
7	406	Not Acceptable ⚠️
8	407	Proxy Authentication Required 🛡️
9	408	Request Timeout ⏱️
10	409	Conflict ⚔️
11	410	Gone ❌
12	411	Length Required 📏
13	412	Precondition Failed ⚠️
14	413	Request Entity Too Large 📦
15	414	Request URI Too Long 🔗
16	415	Unsupported Media Type 📄
17	416	Request Range Not Satisfiable 🚫
18	417	Expectation Failed 😕
19	422	Unprocessable Entity ⚠️
20	423	Locked 🔒
21	424	Failed Dependency ❌
22	500	Internal Server Error 💥
23	501	Not Implemented ⚠️
24	502	Bad Gateway 🚪
25	503	Service Unavailable ❌
26	504	Gateway Timeout ⏳
27	505	HTTP Version Not Supported ⚠️
28	506	Variant Also Negotiates 🔄
29	507	Insufficient Storage 🗄️
30	510	Not Extended 🚫

💡 Tip:
If you encounter any HTTP error codes not mentioned here, feel free to discuss them in the comments below! Sharing your experience can help others troubleshoot issues faster. 🔧💬