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Tcl Examples

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(Tcl) PostXml vs. PostUrlEncoded

This example shows the differences in the HTTP requests sent by PostXml vs. PostUrlEncoded. With PostXml, the body of the request is the XML document itself. With PostUrlEncoded, the body of the request is composed of URL encoded params, as shown in the example below.

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

set http [new_CkHttp]

set strXml "<pets><lizard>Pip</lizard><dog>Fido</dog></pets>"

#  We can log the exact HTTP requests/responses to a session log file.
CkHttp_put_SessionLogFilename $http "qa_output/sessionLog.txt"

#  Send a POST w/ content-type of "application/xml"
CkHttp_SetRequestHeader $http "Content-Type" "application/xml"

#  Note: This example is only interested in examining (via the session log)
#  the HTTP requests that are sent.  We're just sending the post to chilkatsoft.com
#  even though it's not an endpoint designed to handle the POST. We don't care about
#  the response, even if it's an error response status code..
# resp is a CkHttpResponse
set resp [CkHttp_PostXml $http "https://www.chilkatsoft.com/" $strXml "utf-8"]
if {[expr [CkHttp_get_LastMethodSuccess $http] != 1]} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    exit
}

delete_CkHttpResponse $resp

#  This is the HTTP request that is sent.
#  You'll notice the body of the request is the XML document itself.

#  	POST / HTTP/1.1
#  	Content-Type: application/xml
#  	Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
#  	Connection: keep-alive
#  	User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0
#  	Accept-Language: en-us,en;q=0.5
#  	Accept-Encoding: gzip
#  	Host: www.chilkatsoft.com
#  	Content-Length: 48
# 
#  	<pets><lizard>Pip</lizard><dog>Fido</dog></pets>

#  --------
#  Now let's do a PostUrlEncoded...
#  The XML is passed in a query param that is contained in the body of the POST.
set req [new_CkHttpRequest]

CkHttpRequest_AddParam $req "theXml" $strXml
set resp [CkHttp_PostUrlEncoded $http "https://www.chilkatsoft.com/" $req]
if {[expr [CkHttp_get_LastMethodSuccess $http] != 1]} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    delete_CkHttpRequest $req
    exit
}

delete_CkHttpResponse $resp

#  This is the HTTP request that is sent.
#  You'll notice the body of the request is composed of URL encoded query params.

#  	POST / HTTP/1.1
#  	Content-Type: application/x-www-form-urlencoded
#  	Host: www.chilkatsoft.com
#  	Content-Length: 85
# 
#  	theXml=%3Cpets%3E%3Clizard%3EPip%3C%2Flizard%3E%3Cdog%3EFido%3C%2Fdog%3E%3C%2Fpets%3E
# 

#  --------
#  Let's try one more thing...
#  If the query params are not too large, they can be passed in the URL (which means the query params are passed
#  in the HTTP start line.  This is what happens when a URL w/ query params are pasted in a browser.
#  The HTTP verb is "GET" instead of "POST".

set sbUrl [new_CkStringBuilder]

CkStringBuilder_Append $sbUrl "https://www.chilkatsoft.com/?"
CkStringBuilder_Append $sbUrl [CkHttpRequest_getUrlEncodedParams $req]
puts "URL with query params: [CkStringBuilder_getAsString $sbUrl]"
set strResponse [CkHttp_quickGetStr $http [CkStringBuilder_getAsString $sbUrl]]

#  The URL with query params is:  https://www.chilkatsoft.com/?theXml=%3Cpets%3E%3Clizard%3EPip%3C%2Flizard%3E%3Cdog%3EFido%3C%2Fdog%3E%3C%2Fpets%3E

#  The HTTP request looks like this.  You can see there is no request body, and the query params
#  are in the path part of the start line.

#  	GET /?theXml=%3Cpets%3E%3Clizard%3EPip%3C%2Flizard%3E%3Cdog%3EFido%3C%2Fdog%3E%3C%2Fpets%3E HTTP/1.1
#  	Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
#  	Connection: keep-alive
#  	User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0
#  	Accept-Language: en-us,en;q=0.5
#  	Accept-Encoding: gzip
#  	Host: www.chilkatsoft.com

delete_CkHttp $http
delete_CkHttpRequest $req
delete_CkStringBuilder $sbUrl

 

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