mirror of https://github.com/moparisthebest/curl
added some -c talk, spell checked
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Daniel Stenberg
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Online: http://curl.haxx.se/docs/httpscripting.shtml
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Author: Daniel Stenberg <daniel@haxx.se>
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Date: August 20, 2001
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Version: 0.4
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Date: October 31, 2001
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Version: 0.5
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The Art Of Scripting HTTP Requests Using Curl
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=============================================
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@ -48,7 +48,7 @@ Version: 0.4
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2. URL
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The Uniform Resource Locator format is how you specify the address of a
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particular resource on the internet. You know these, you've seen URLs like
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particular resource on the Internet. You know these, you've seen URLs like
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http://curl.haxx.se or https://yourbank.com a million times.
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3. GET a page
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@ -56,7 +56,7 @@ Version: 0.4
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The simplest and most common request/operation made using HTTP is to get a
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URL. The URL could itself refer to a web page, an image or a file. The client
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issues a GET request to the server and receives the document it asked for.
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If you isse the command line
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If you issue the command line
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curl http://curl.haxx.se
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@ -89,7 +89,7 @@ Version: 0.4
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<input type=submit name=press value="OK">
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</form>
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In your favourite browser, this form will appear with a text box to fill in
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In your favorite browser, this form will appear with a text box to fill in
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and a press-button labeled "OK". If you fill in '1905' and press the OK
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button, your browser will then create a new URL to get for you. The URL will
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get "junk.cgi?birthyear=1905&press=OK" appended to the path part of the
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@ -136,8 +136,8 @@ Version: 0.4
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4.3 FILE UPLOAD POST
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Back in late 1995 they defined a new way to post data over HTTP. It was
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documented in the RFC 1867, why this method sometimes is refered to as
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a rfc1867-posting.
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documented in the RFC 1867, why this method sometimes is referred to as
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a RFC1867-posting.
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This method is mainly designed to better support file uploads. A form that
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allows a user to upload a file could be written like this in HTML:
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@ -182,7 +182,7 @@ Version: 0.4
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way your browser does.
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An easy way to get to see this, is to save the HTML page with the form on
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your local disk, mofidy the 'method' to a GET, and press the submit button
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your local disk, modify the 'method' to a GET, and press the submit button
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(you could also change the action URL if you want to).
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You will then clearly see the data get appended to the URL, separated with a
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@ -214,7 +214,7 @@ Version: 0.4
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Sometimes your HTTP access is only available through the use of a HTTP
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proxy. This seems to be especially common at various companies. A HTTP proxy
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may require its own user and password to allow the client to get through to
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the internet. To specify those with curl, run something like:
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the Internet. To specify those with curl, run something like:
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curl -U proxyuser:proxypassword curl.haxx.se
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@ -294,7 +294,7 @@ Version: 0.4
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contents to the server, unless of course they are expired.
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Many applications and servers use this method to connect a series of requests
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into a single logical session. To be able to use curl in such occations, we
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into a single logical session. To be able to use curl in such occasions, we
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must be able to record and send back cookies the way the web application
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expects them. The same way browsers deal with them.
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@ -325,6 +325,15 @@ Version: 0.4
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curl -b nada -L www.cookiesite.com
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Curl has the ability to read and write cookie files that use the same file
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format that Netscape and Mozilla do. It is a convenient way to share cookies
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between browsers and automatic scripts. The -b switch automatically detects
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if a given file is such a cookie file and parses it, and by using the
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-c/--cookie-jar option you'll make curl write a new cookie file at the end of
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an operation:
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curl -b cookies.txt -c newcookies.txt www.cookiesite.com
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11. HTTPS
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There are a few ways to do secure HTTP transfers. The by far most common
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@ -349,7 +358,7 @@ Version: 0.4
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you need to enter the unlock-code before the certificate can be used by
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curl. The PIN-code can be specified on the command line or if not, entered
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interactively when curl queries for it. Use a certificate with curl on a
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https server like:
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HTTPS server like:
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curl -E mycert.pem https://that.secure.server.com
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@ -358,10 +367,12 @@ Version: 0.4
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RFC 2616 is a must to read if you want in-depth understanding of the HTTP
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protocol.
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RFC 2396 explains the URL syntax
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RFC 2396 explains the URL syntax.
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RFC 2109 defines how cookies are supposed to work.
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RFC 1867 defines the HTTP post upload format.
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http://www.openssl.org is the home of the OpenSSL project
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http://curl.haxx.se is the home of the cURL project
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