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cfhttpparam

Last updated on | Also Applies to ColdFusion

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Description

Allowed inside cfhttp tag bodies only. Required for cfhttp POST operations. Optional for all others. Specifies parameters to build an HTTP request.

Syntax

Note: You can specify this tag's attributes in an attributeCollection attribute whose value is a structure. Specify the structure name in the attributeCollection attribute and use the tag's attribute names as structure keys.

The cfhttpparam tag ignores -_.!~*'() characters while encoding. If these characters are used as its values, then these characters are not encoded. This feature helps to avoid any issues with the URL at the receiving end.

History

ColdFusion MX 6.1:

Added the header and body types.
Added the encoded and mimeType attributes.
Changed HTTP method behavior: all HTTP methods can have httpparam tags.
Changed the name attribute requirements: it is not required for all types.

Attributes

Attribute	Req/Opt	Default	Description
type	Required		Information type: header: specifies an HTTP header. ColdFusion does not URL encode the header. CGI: specifies an HTTP header. ColdFusion URL encodes the header by default. body: specifies the body of the HTTP request. ColdFusion does not automatically set a content-type header or URL encode the body contents. To specify the content-type, use a separate cfhttpparam tag with type=header. XML: identifies the request as having a content-type of text/xml. Specifies that the value attribute contains the body of the HTTP request. Used to send XML to the destination URL. ColdFusion does not URL encode the XML data. file: tells ColdFusion to send the contents of the specified file. ColdFusion does not URL encode the file contents. URL: specifies a URL query string name-value pair to append to the cfhttp url attribute. ColdFusion URL encodes the query string. formField: specifies a form field to send. ColdFusion URL encodes the Form field by default. cookie: specifies a cookie to send as an HTTP header. ColdFusion URL encodes the cookie.
encoded	Optional	yes	Applies to FormField and CGI types; ignored for all other types. Specifies whether to URL encode the form field or header.
file	Required only if type="File"		Applies to File type; ignored for all other types. The absolute path to the file that is sent in the request body.
mimeType	Optional		Applies to File type; invalid for all other types. Specifies the MIME media type of the file contents. The content type can include an identifier for the character encoding of the file; for example, text/html; charset=ISO-8859-1 indicates that the file is HTML text in the ISO Latin-1 character encoding.
name	Required. Optional (and ignored) for Body and XML types		Variable name for data that is passed. Ignored for Body and XML types. For File type, specifies the filename to send in the request.
value	Required. Optional (and ignored) for File type		Value of the data that is sent. Ignored for File type. The value must contain string data or data that ColdFusion can convert to a string for all type attributes except Body. Body types can have string or binary values.

Usage

Specifies header or body data to send in the HTTP request. The type attribute identifies the information that the parameter specifies. A cfhttp tag can have multiple cfhttpparam tags, subject to the following limitations:

An XML type attribute cannot be used with additional XML type attributes, or with body, file, or formField type attributes.
A body type attribute cannot be used with additional body type attributes, or with XML, file, or formField type attributes.
The XML and body type attributes cannot be used with the cfhttp tag TRACE method.
The file type attribute is only meaningful**with the cfhttp tag POST and PUT methods.
The formField type attribute is only meaningful**with the cfhttp tag POST and GET methods.
If you send an HTTP request to a ColdFusion page, all HTTP headers, not just those sent using the CGI type, are available as CGI scope variables, However, any custom variables (such as "myVar") do not appear in a dump of the CGI scope.
When you send a file using the type="file" attribute, the file content is sent in the body of a multipart/form-data request. If you send the file to a ColdFusion page, the Form scope of the receiving page contains an entry with the name you specified in the cfhttpparam tag name attribute as the key. The value of this variable is the path to a temporary file containing the file that you sent. If you also send Form field data, the location of the filename in the form.fieldnames key list depends on the position of the cfhttpparam tag with the file relative to the cfhttp tags with the form data.URL-encoding preserves special characters (such as the ampersand) when they are passed to the server. For more information, see the function URLEncodedFormat. To send arbitrary data in a "raw" HTTP message, use a cfhttpparam tag with a type="body" attribute to specify the body content and use cfhttpparam tags with a type="header" attributes to specify the headers.

Example

<!--- This example consists of two CFML pages. 
The first page posts to the second. ---> 

<!--- The first, posting page. 
This page posts variables to another page and displays the body of the response from 
the second page. Change the URL and port as necessary for your environment. ---> 

<cfhttp 
method="post" 
url="http://127.0.0.1/tests/http/cfhttpparamexample.cfm" 
port="8500" 
throwonerror="Yes"> 
<cfhttpparam name="form_test" type="FormField" value="This is a form variable"> 
<cfhttpparam name="url_test" type="URL" value="This is a URL variable"> 
<cfhttpparam name="cgi_test" type="CGI" value="This is a CGI variable"> 
<cfhttpparam name="cookie_test" type="Cookie" value="This is a cookie"> 
</cfhttp> 

<!--- Output the results returned by the posted-to page. ---> 
<cfoutput> 
#cfhttp.fileContent# 
</cfoutput> 


<!--- This is the cfhttpparamexample.cfm page that receives and processes the Post request. Its response body is the generated HTML output. ---> 

<h3>Output the passed variables</h3> 
<cfoutput> 
Form variable: #form.form_test# 
<br>URL variable: #URL.url_test# 
<br>Cookie variable: #Cookie.cookie_test# 
<br>CGI variable: #CGI.cgi_test#<br> 
<br>Note that the CGI variable is URL encoded. 
</cfoutput>

cfhttpparam

Description

Category

Syntax

See also

History

Attributes

Usage

Example

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