Curl Multiple Headers

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There are many online tools where you can test your website’s headers. But there is a simply way to check the headers for one site with a local tool – cURL. cURL (Client URL) is a tool for transferring information through various protocols.

The curl command supports -H or -header option to pass extra HTTP header to use when getting a web page from your web server. You may specify any number of extra headers. When you add a custom header that has the same name as one of the internal ones curl would use, your externally set header will be used instead of the internal one.

I found a lot of examples on how to use simple POST commands in cURL, but I didn't find examples on how to send full HTTP POST commands, which contain: Headers (Basic Authentication) HTTP Params (. H/-header header (HTTP) Extra header to use when getting a web page. You may specify any number of extra headers. Note that if you should add a custom header that has the same name as one of the internal ones curl would use, your externally set header will be used instead of the internal one. Curl is powered by Libcurl. This tool is preferred for automation, since it is designed to work without user interaction. Curl can transfer multiple file at once. Syntax: curl options URL. URL: The most basic uses of curl is typing the command followed by the URL. Curl https://www.geeksforgeeks.org.

In our case, we will use it to get the headers for a specific site. The command is:

An example for our domain name is presented below. You see that the tool is getting only the headers and it also follows the redirection from plothost.com to https://www.plothost.com

Resources:

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From: Daniel Stenberg <daniel-curl_at_haxx.se>
Date: Mon, 2 Feb 2004 22:55:33 +0100 (CET)

On Mon, 2 Feb 2004, Kristopher Spencer-Yates wrote:

> It appears my headers still aren't being received. In fact, I am changing
> the CONTENT-TYPE header with -H and using -0 for http1.0 but the receiver
> does not receive what I think it should (my headers). here is my command
> line

I think you're somehow not doing it right. I simply can't make this fail when
I try to use it.

Curl Multiple Header Lines

> /usr/local/bin/curl -0 -X '/AUTHORIZE' -d '<someXML></someXML' -m 120 -H
> 'MIME-VERSION: 1.0' -H 'CONTENT-TYPE: application/PTI21' -H
> 'CONTENT-TRANSFER-ENCODING: text' -H 'REQUEST-NUMBER: 1' -H
> 'DOCUMENT-TYPE: Request' http://the_url:the_portnumber -L

Why are you using uppercase all over? It makes my head hurt! ;-)

I tried this:

$ cd tests

[ cd'ed into the tests directory ]

$ ./server/sws &

[ started the test WWW server that runs on port 8999 by default]

$ curl localhost:8999/1 -H 'test1: yes' -H 'test2: yes' -H 'Pragma: fake' -H
'Host: lalala' -H 'ACCEPT: woohoo'

[ this fetches the data from test case 1, with an additional set of fun -H
arguments ]

$ cat log/server.input
GET /1 HTTP/1.1
User-Agent: curl/7.10.6 (i686-pc-linux-gnu) libcurl/7.10.6 OpenSSL/0.9.7a ipv6
zlib/1.1.3 GSS
test1: yes
test2: yes
Pragma: fake
Host: lalala
ACCEPT: woohoo

[ this shows a somewhat older version supporting all this that I claim it
does. Using my dev version gives the same result. ]

> Output from receiver below:

Your MacBook Pro comes with apps for everything you want to do. Edit and share your photos. Enjoy music, books, movies, and more. Create presentations. And discover new apps in the App Store, including iPhone and iPad apps that now run on Macs with Apple M1 chip. Learn about apps included with your Mac. Testing conducted by Apple in October 2020 using preproduction MacBook Air systems with Apple M1 chip and 8-core GPU, configured with 8GB of RAM and 512GB SSD. The Apple TV app movie playback test measures battery life by playing back HD 1080p content with display brightness set to 8 clicks from bottom. Battery life varies by use and configuration. MacBook Pro (Retina, 15-inch, Mid 2012 - 2015) MacBook (Retina, 12-inch, Early 2015–2017) iMac (Retina 4K, 21.5-inch, 2019 and later). Apple AirPlay 2 with Apple TV Provided you have tvOS 11 or later, your Apple TV can send audio to speakers around your home as well, rather than just coming from your iPhone or iPad. Apple airplay macbook pro 2009. Your device might automatically stream video to the Apple TV or AirPlay 2-compatible smart TV that you frequently use. If you open a video app and see in the upper-left corner, then an AirPlay device is already selected. To use AirPlay with a different device, tap, then tap another device, or tap 'iPhone' to stop streaming with AirPlay.

Multiple

> ACCEPT: IMAGE/GIF, IMAGE/X-XBITMAP, IMAGE/JPEG, IMAGE/PJPEG, */*
> USER-AGENT: CURL/7.10.8 (I386-PORTBLD-FREEBSD4.8) LIBCURL/7.10.8
> OPENSSL/0.9.7A

Why is the receiver converting everything to uppercase?

Multiple

> Any ideas on how I should pass multiple headers? What am I missing? Or is
> this not possible?

I don't understand how this cannot work for you. It works for me, as above.

Received on 2004-02-02

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Curl Multiple Header Info

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