---
# System prepended metadata

title: Web working

---

# Web working 

[TOC]


# DNS Detail


## Domain Hierarchy 


### Top-Level Domain 

![](https://i.imgur.com/KWZ3xtz.png)

- GTLD
- CCTLD 

### Second-level Domain 

![](https://i.imgur.com/IO0KCQu.png)


### Sub domain 

![](https://i.imgur.com/MrMLOC0.png)

#### limit 
![](https://i.imgur.com/ISg145K.png)



## Records type 


### A Record 

![](https://i.imgur.com/0L9Drv1.png)


### AAAA Record 

![](https://i.imgur.com/OL7l3Mr.png)


### CNAME Record 


![](https://i.imgur.com/lSCQsFG.png)


- bolg.meowhecker.com -> meowhecker.com
- shop.meowhecker.com -> meowhecker.com
- fish.meowhecker.com -> meowhecker.com 


Nslookup
![](https://i.imgur.com/sf5ZtiO.png)



### MX Record 

Query SMTP server IP 

![](https://i.imgur.com/6IeHwPR.png)

Nslookup
![](https://i.imgur.com/4eHqltq.png)


### TxT Record 

![](https://i.imgur.com/cwLrdfh.png)

Nslookup
![](https://i.imgur.com/dzDZC5H.png)



## DNS request 

![](https://i.imgur.com/yjRtzov.png)


# HTTP



## Request/Response

### URL 

![](https://i.imgur.com/AGhTkzp.png)



### Maker Request 

![](https://i.imgur.com/FhuXZZw.png)


![](https://i.imgur.com/FeZfzj9.png)


### Response 

![](https://i.imgur.com/q9DYUTF.png)


## HTTP Method 

![](https://i.imgur.com/iiM37cS.png)


## HTTP status code 


### Information response 0~199

![](https://i.imgur.com/xb1fRU5.png)


### Success 200~299

![](https://i.imgur.com/wYHRn07.png)


### Redirection 300~399

![](https://i.imgur.com/lYbXcwm.png)


### Client Error 400~499

![](https://i.imgur.com/0tmprZk.png)


### Server Error 500~599

![](https://i.imgur.com/3Bxugtx.png)


# Website working 

![](https://i.imgur.com/QQALbnB.png)


## Load Balances 

![](https://i.imgur.com/31R6PCd.png)


## CDN

![](https://i.imgur.com/7sYolhu.png)

## WAF

![](https://i.imgur.com/jXZDmE4.png)

## Web server working 


### Web server 

![](https://i.imgur.com/41VAtfc.png)

### Virtual host 

![](https://i.imgur.com/AsG5JNh.png)



