cURL Talk

class: center,middle

# cURL
### [brettlangdon](http://brett.is) | [Shapeways](https://www.shapeways.com)
 http://brettlangdon.github.io/curl-talk

---

# What is cURL?

CLI tool for getting/sending files via URL's

Supported Protocols:
.float-block[
* DICT
* FILE
* FTP
* FTPS
* GOPHER
* HTTP
* HTTPS]
.float-block[
* IMAP
* IMAPS
* LDAP
* LDAPS
* POP3
* POP3S
* RTMP]
.float-block[
* RTSP
* SCP
* SFTP
* SMTP
* SMTPS
* TELNET
* TFTP]

---

# Quick Examples

```bash
$ curl http://icanhazip.com
108.46.182.85

$ curl -i http://icanhazip.com
HTTP/1.1 200 OK
Date: Sat, 26 Apr 2014 19:49:57 GMT
Server: Apache
Content-Length: 14
Content-Type: text/plain; charset=UTF-8
Connection: close

108.46.182.85
```

---

# Useful CLI Arguments

* `-v` - __Verbose:__ Make cURL more talkative
* `-h` - __Help:__ Show all CLI options
* `-F CONTENT` - __Form Data:__ Add Multipart Form data to request
* `-H HEADER` - __Header:__ Add HEADER to request header
* `-X COMMAND` - __Method:__ Which request method to use (GET/POST/etc)
* `-o FILE` - __Output:__ Output to FILE rather than stdout
* `-L` - __Follow Redirects:__ Follow all redirects

---

# Download a File

```bash
$ curl http://www.google.com
<!doctype html><html itemscope=""
itemtype="http://schema.org/WebPage"
lang="en"><head>
...
```

### Save to a File

```bash
$ curl -o google.com http://www.google.com
```

---

# Response Headers Only

```bash
$ curl -I http://www.google.com
HTTP/1.1 200 OK
Date: Sat, 26 Apr 2014 20:40:04 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=61629e9495553921:FF=0:TM=1398544804:LM=...
Set-Cookie: NID=67=HHSAgTCIZ3zd6w2hjrNqoX1VX9NDaqscV9YckpI2...
P3P: CP="This is not a P3P policy! See ..."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Alternate-Protocol: 80:quic
Transfer-Encoding: chunked
```

---

# Save/Reuse Cookies

```bash
$ curl -c cookies http://www.google.com
$ cat cookies
# Netscape HTTP Cookie File
# http://curl.haxx.se/docs/http-cookies.html
# This file was generated by libcurl! Edit at your own risk.

ID=bec963a425f5d8ca:FF=0:TM=1398545024:LM=1398545024:S=...
67=BV0jhMokci-G3ZbOJ2UeFaNX1faFdfbFVcPHYIpAh35Uz2th6lVq...
# resuse stored cookies
$ curl -c cookies -b cookies http://www.google.com
```