๐ก Engineering IT Glossary: Infra & Cloud โ Executive Summary
Technical architectural analysis, practical configuration manifests, and deployment instructions for Engineering IT Glossary: Infra & Cloud.
Web development common
Basic Terminology
Parameter
- Parameters used in function definition
aandbbelow are parameters of thetestfunction.
javascript
function test(a, b) {
return a + b;
}Argument
- Argument values passed when using a function
canddbelow are arguments when callingtest.
javascript
const c = 20;
const d = 10;
test(c, d);Query Parameter
- In URL ? Subsequent key=value pairs
aandbbelow are query parameters of the request.
bash
curl -XGET http://aaa.bbb.ccc/ddd?a=10&b=20Path Parameter (or Path Variable)
- Variables included as part of URI (path)
123below is the Path Parameter of the request.
bash
curl -XGET http://aaa.bbb.ccc/eee/123Payload
- Data included in
POST,PUT,PATCHRequest Body - The JSON data in the
-dflag below is Payload.
bash
curl -XPOST http://aaa.bbb.ccc/fff/ \
-H "Content-Type: application/json" \
-d '{"name": "Alice", "age": 30}'URI
- Identifier of the resource (any string representing the resource)
- Example: mailto:[email protected]
URL
- Identifier including location and access method (scheme) of the resource
- Example: https://example.com/page
- URL is a subconcept of URI.
HTTP status code
โ 1xx (Informational) โ Informational response
| Code | Meaning | Description |
| 100 Continue | keep going | If the client sends Expect: 100-continue, the server responds asking to continue. |
| 101 Switching Protocols | Protocol Switching | Used when changing the protocol to WebSocket, etc. |
โ 2xx (Success) โ Request Success
| Code | Meaning | Description | Example |
| 200 OK | Request Success | Typical response for most requests, such as GET, PUT, etc. | GET /users |
| 201 Created | Resource creation successful | When a new resource is created with a POST request | POST /users |
| 202 Accepted | Accept request (asynchronous processing) | When still processing (e.g. stored in queue) | Large batch operations, etc. |
| 204 No Content | Request successful, no response body | When no response is required, such as a DELETE request | DELETE /users/123 |
bash
curl -XDELETE http://aaa.bbb.ccc/users/123
# ์๋ต: HTTP/1.1 204 No Contentโ ๏ธ 3xx (Redirection) โ Redirection
| Code | Meaning | Description |
| 301 Moved Permanently | permanent move | Resource moved to another URI |
| 302 found | temporary move | Temporarily respond with a different URI |
| 304 Not Modified | no change | Cached resources can be used as is (when using If-Modified-Since, etc.) |
โ 4xx (Client Error) โ Client Error
| Code | Meaning | Description | Example |
| 400 Bad Request | bad request | Parameter error, JSON parsing failure, etc. | |
| 401 Unauthorized | Authentication required | Token missing, invalid | |
| 403 Forbidden | no access | No permission (authenticated but denied) | |
| 404 Not Found | doesn’t exist | Bad URLs, deleted resources, etc. | |
| 409 Conflict | crash occurred | Duplicate data, version conflicts, etc. | |
| 422 Unprocessable Entities | Unable to process | Mainly used when validation fails (e.g. name is required but missing) |
bash
curl -XPOST http://aaa.bbb.ccc/users \
-H "Content-Type: application/json" \
-d '{"age": 30}'
# ์๋ต: HTTP/1.1 422 Unprocessable Entity๐ฅ 5xx (Server Error) โ Server Error
| Code | Meaning | Description |
| 500 Internal Server Error | Server internal error | Exception handling failure, runtime error, etc. |
| 502 Bad Gateway | gateway error | Proxy/Gateway server receives invalid response |
| 503 Service Unavailable | Service unavailable | Server overload, under maintenance |
| 504 Gateway Timeout | gateway timeout | Backend server response delay |
Web Storage
Cookie
- Accessible from both browser and server
- Automatically sent to the server with each request
- Expiration date can be set
LocalStorage
- Only accessible through browser
- Keep until manually deleted
- Not sent to server
SessionStorage
- Only accessible through browser
- Deleted when tab is closed
- Not sent to server
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