Chilkat Examples

ChilkatHOME.NET Core C#Android™AutoItCC#C++Chilkat2-PythonCkPythonClassic ASPDataFlexDelphi ActiveXDelphi DLLGoJavaLianjaMono C#Node.jsObjective-CPHP ActiveXPHP ExtensionPerlPowerBuilderPowerShellPureBasicRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++VB.NETVBScriptVisual Basic 6.0Visual FoxProXojo Plugin

Unicode C Examples

Web API Categories

ASN.1
AWS KMS
AWS Misc
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Key Vault
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Cloud Signature CSC
Code Signing
Compression
DKIM / DomainKey
DNS
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
Misc
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
SharePoint Online
Signing in the Cloud
Socket/SSL/TLS
Spider
Stream
Tar Archive
ULID/UUID
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl
uncategorized

 

 

 

(Unicode C) REST Follow Redirects

Demonstrates how to follow a 302/303 redirect response.

Chilkat C/C++ Library Downloads

MS Visual C/C++

Linux/CentOS C/C++

Alpine Linux C/C++

MAC OS X C/C++

armhf/aarch64 C/C++

C++ Builder

iOS C/C++

Android C/C++

Solaris C/C++

MinGW C/C++

#include <C_CkRestW.h>
#include <C_CkUrlW.h>

void ChilkatSample(void)
    {
    HCkRestW rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    BOOL success;
    const wchar_t *responseText;
    int statusCode;
    HCkUrlW redirectUrl;

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

    rest = CkRestW_Create();

    bTls = TRUE;
    port = 443;
    bAutoReconnect = TRUE;
    success = CkRestW_Connect(rest,L"chilkatsoft.com",port,bTls,bAutoReconnect);
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        return;
    }

    // Send a POST to a URL that will respond with a 302 redirect..
    CkRestW_AddQueryParam(rest,L"firstName",L"John");
    CkRestW_AddQueryParam(rest,L"lastName",L"Doe");
    responseText = CkRestW_fullRequestFormUrlEncoded(rest,L"POST",L"/echoPost302.asp");
    if (CkRestW_getLastMethodSuccess(rest) != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        return;
    }

    statusCode = CkRestW_getResponseStatusCode(rest);

    // Examine the response status code
    if (statusCode < 300) {
        wprintf(L"Not a redirect.\n");
        wprintf(L"%s\n",responseText);
        CkRestW_Dispose(rest);
        return;
    }

    if (statusCode > 399) {
        wprintf(L"Error response: Status code = %d\n",statusCode);
        wprintf(L"%s\n",responseText);
        CkRestW_Dispose(rest);
        return;
    }

    wprintf(L"Redirect status code = %d\n",statusCode);

    // The response header will contain a Location field with the redirect URL, such as this:
    // Location: http://www.chilkatsoft.com/echoPostFinal.asp

    // The response status code determines how the client should behave.
    // Here are some common possibilities:

    // 301: Moved Permanently
    // This and all future requests should be directed to the given URI.  (Keep the original HTTP method for the redirect.  In this case, the 
    // original request was a POST, so we POST to the redirect URL.)

    // 302: Found (aka Object Moved aka Moved Temporarily)
    // This is the most popular redirect code, but also an example of industrial practice contradicting the standard. HTTP/1.0 specification (RFC 1945 ) required the client
    // to perform a temporary redirect (the original describing phrase was Moved Temporarily), but popular browsers implemented it as a 303 See Other. Therefore, HTTP/1.1
    // added status codes 303 and 307 to disambiguate between the two behaviors. However, the majority of Web applications and frameworks still use the 302 status code
    // as if it were the 303.

    // 303: See Other
    // The response to the request can be found under another URI using a GET method. When received in response to a PUT, it should be assumed that the server has
    // received the data and the redirect should be issued with a separate GET message.

    // 307: Temporary Redirect
    // In this occasion, the request should be repeated with another URI, but future requests can still use the original URI. In contrast to 303, the request method
    // should not be changed when reissuing the original request. For instance, a POST request must be repeated using another POST request.

    wprintf(L"%s\n",CkRestW_responseHeader(rest));

    redirectUrl = CkRestW_RedirectUrl(rest);
    if (CkRestW_getLastMethodSuccess(rest) == FALSE) {
        wprintf(L"No Location header found for redirect.\n");
        CkRestW_Dispose(rest);
        return;
    }

    // Prep for the redirect..
    CkRestW_ClearAllParts(rest);

    // Disconnect and re-connect.  
    // (This can be skipped if both the host and SSL/TLS conditions are the same.)
    CkRestW_Disconnect(rest,100);
    success = CkRestW_Connect(rest,CkUrlW_host(redirectUrl),CkUrlW_getPort(redirectUrl),CkUrlW_getSsl(redirectUrl),bAutoReconnect);
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkRestW_Dispose(rest);
        return;
    }

    if ((statusCode == 301) || (statusCode == 307)) {
        // Redirect using a POST, sending the same params to the new destination
        CkRestW_AddQueryParam(rest,L"firstName",L"John");
        CkRestW_AddQueryParam(rest,L"lastName",L"Doe");
        responseText = CkRestW_fullRequestFormUrlEncoded(rest,L"POST",CkUrlW_path(redirectUrl));
        if (CkRestW_getLastMethodSuccess(rest) != TRUE) {
            wprintf(L"%s\n",CkRestW_lastErrorText(rest));
            CkRestW_Dispose(rest);
            return;
        }

    }

    if ((statusCode == 302) || (statusCode == 303)) {
        // Redirect using a GET, sending the query params found in the redirect URL.
        responseText = CkRestW_fullRequestFormUrlEncoded(rest,L"GET",CkUrlW_pathWithQueryParams(redirectUrl));
        if (CkRestW_getLastMethodSuccess(rest) != TRUE) {
            wprintf(L"%s\n",CkRestW_lastErrorText(rest));
            CkRestW_Dispose(rest);
            return;
        }

    }

    // Show the final status code and the response text.
    wprintf(L"Final status code = %d\n",CkRestW_getResponseStatusCode(rest));

    wprintf(L"Final response text (HTML, XML, JSON, or whatever..)\n");
    wprintf(L"%s\n",responseText);


    CkRestW_Dispose(rest);

    }

 

© 2000-2024 Chilkat Software, Inc. All Rights Reserved.