(Unicode C++) curl with Variable Substitution in an XML Request Body

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This example shows how to use variables inside an XML request body using the {{variable_name}} syntax. When the HTTP request’s Content-Type indicates XML, Chilkat automatically applies proper XML entity encoding to each substituted value, ensuring the resulting XML remains valid.

Note: This example requires Chilkat v11.5.0 or greater.

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#include <CkStringBuilderW.h>
#include <CkHttpCurlW.h>

void ChilkatSample(void)
    {
    bool success = false;

    // Variable names are enclosed between {{ and }}

    // curl -X POST https://api.example.com/api/orders \
    //   -H "Content-Type: application/xml; charset=utf-8" \
    //   -H "Accept: application/xml" \
    //   -d '<order>
    //   <customerName>{{customer_name}}</customerName>
    //   <note>{{note}}</note>
    //   <address>{{address}}</address>
    //   <instructions>{{instructions}}</instructions>
    // </order>'

    CkStringBuilderW sbCurl;
    sbCurl.AppendLn(L"curl -X POST https://api.example.com/api/orders \\");
    sbCurl.AppendLn(L"  -H \"Content-Type: application/xml; charset=utf-8\" \\");
    sbCurl.AppendLn(L"  -H \"Accept: application/xml\" \\");
    sbCurl.AppendLn(L"  -d '<order>");
    sbCurl.AppendLn(L"  <customerName>{{customer_name}}</customerName>");
    sbCurl.AppendLn(L"  <note>{{note}}</note>");
    sbCurl.AppendLn(L"  <address>{{address}}</address>");
    sbCurl.AppendLn(L"  <instructions>{{instructions}}</instructions>");
    sbCurl.AppendLn(L"</order>'");

    CkHttpCurlW curl;

    // The values below contain chars that will require XML entity encoding.  
    // Chilkat will automatically do the encoding because the Content-Type of this request is "application/xml"
    curl.SetVar(L"customer_name",L"John & Sons");
    curl.SetVar(L"note",L"He said \"Ship it ASAP!\"");
    curl.SetVar(L"address",L"123 <Main> Street");
    curl.SetVar(L"instructions",L"Use door #2 & call upon arrival");

    // To demonstrate how the variables are replaced, this example does not execute the curl command. 
    // Instead, it generates the raw HTTP request that would be sent if the curl command were run.
    CkStringBuilderW sbRawRequest;
    success = curl.ToRawRequest(sbCurl.getAsString(),sbRawRequest);
    if (success == false) {
        wprintf(L"%s\n",curl.lastErrorText());
        return;
    }

    wprintf(L"%s\n",sbRawRequest.getAsString());

    // The output is shown below.
    // Notice the chars that were XML entity encoded.

    // POST /api/orders HTTP/1.1
    // Accept: application/xml
    // Host: api.example.com
    // Content-Type: application/xml; charset=utf-8
    // Content-Length: 229
    // 
    // <order>
    //   <customerName>John &amp; Sons</customerName>
    //   <note>He said &quot;Ship it ASAP!&quot;</note>
    //   <address>123 &lt;Main&gt; Street</address>
    //   <instructions>Use door #2 &amp; call upon arrival</instructions>
    // </order>
    }