Question 1

What's the difference between `-d`, `--data-raw`, and `--data-binary`?

Accepted Answer

`-d` (alias `--data`) URL-encodes the body and switches the method to POST automatically if not specified. `--data-raw` skips the `@filename` interpretation but still treats the content as form-encoded. `--data-binary` sends the bytes literally, preserving newlines and not URL-encoding. For JSON, always use `--data-raw '{...}'` (or `--data '{...}'` if you trust no `@` will appear).

Question 2

Why does curl POST when I didn't ask it to?

Accepted Answer

Adding `-d`, `-F`, or `--data-*` flags implicitly sets the method to POST. If you want a different method (PUT, DELETE) with a body, add `-X PUT` explicitly. Note that `-X` only sets the request line, it doesn't change content type or anything else; if you set `-X GET` but include `-d`, you'll get a GET with a body, which most servers reject.

Question 3

How do I send a JSON body?

Accepted Answer

Three flags: `-X POST`, `-H 'Content-Type: application/json'`, and `--data-raw '<your json>'`. The Content-Type matters; without it, the server may treat the body as form-urlencoded and fail to parse. Quoting tip: wrap the JSON in single quotes on Unix shells to avoid escaping every double quote. On Windows cmd, you need to escape internal double quotes with backslash, which is why the generated command should pick the right form.

Question 4

What's the right way to handle authentication?

Accepted Answer

Basic auth: `-u user:pass` (curl handles the Base64 encoding). Bearer token: `-H 'Authorization: Bearer YOUR_TOKEN'`. API key in header: `-H 'X-API-Key: ...'`. Cookies: `-b 'name=value; name2=value2'` or `-b cookies.txt`. Avoid passing secrets on the command line in shared environments, they appear in process lists and shell history.

Question 5

How do I follow redirects?

Accepted Answer

`-L` (alias `--location`). Without it, curl prints the 301/302 response without following. Add `--max-redirs N` to cap; default is 50. Watch out: `-L` re-sends the body on redirect (which is correct per spec for 307/308 but surprising for 301/302, for which it does NOT re-send by default unless you add `--post301 --post302`).

Question 6

How do I save the response to a file?

Accepted Answer

`-o filename` writes the response body to that file. `-O` (uppercase) uses the remote filename from the URL. `-i` includes headers in the output; `-D headers.txt` writes only the headers to a separate file. For binary content (images, archives), always combine with `--output-dir` and check that your shell isn't doing newline conversion (Windows).

Question 7

Are my URLs and headers stored anywhere?

Accepted Answer

No. The command is assembled in your browser via simple string concatenation. No telemetry, no network round-trip. Treat the generated curl as a credential when it contains auth tokens, store it in a password manager or as a `.sh` script with restricted permissions, not in a shared chat.

Question 8

What standards does cURL Command Generator validate against?

Accepted Answer

cURL Command Generator checks compliance with curl command-line syntax, RFC 9110 (HTTP).

Question 9

What are the limitations of cURL Command Generator?

Accepted Answer

Does not handle multipart file uploads Does not generate Windows PowerShell-compatible curl syntax Does not handle NTLM/Kerberos authentication

Flag	Functionality	Implicit Behavior	Use Case
`-X` / `--request`	Sets HTTP Verb	None (Modifies request line only)	PUT / DELETE / PATCH
`-H` / `--header`	Appends Header	Overrides default cURL headers	Auth / Content-Type
`-d` / `--data`	Sends Body	Forces POST, URL-encodes	Form Submission
`--data-raw`	Sends Raw Body	Forces POST, Ignores `@`	JSON / GraphQL

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