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ICS V8.68 has been released at: http://wiki.overbyte.eu/wiki/index.php/ICS_Download ICS is a free internet component library for Delphi 7, 2006 to 2010, XE to XE8, 10 Seattle, 10.1 Berlin, 10.2 Tokyo, 10.3 Rio, 10.4 Sydney and 11.0 and C++ Builder 2006 to XE3, 10.2 Tokyo, 10.3 Rio, 10.4 Sydney and 11.0. ICS supports VCL and FMX, Win32, Win64 and MacOS 32-bit targets. The distribution zip includes the latest OpenSSL 3.0.1 win32, with other versions of OpenSSL being available from the download page.


Major Changes in ICS V8.68 include:

 

1 - V8.68 is a minor release, mainly HTTP client and server improvements including new request and response headers to assist browser caching and conditional requests, improved error reporting to help diagnose failed HTTP requests, and improvements in the HTTP REST component allowing it to save files including resuming failed downloads and download files of any size.  There are minor fixes in various components, and updates to installing on MacOS and C++ Builder. There is also a new File Clean-Up demo ideal for deleting the old log files that many applications (including some ICS samples) leave on systems.

 

2 -The HTTP client TSslHttpCli now keeps the Etag response header as ResponseEtag, allowing applications to save it with the page content, and when requesting a refresh to add the request method ReqIfNoneMatch or ReqIfMatch to avoid downloading the page again. Improved RequestDoneError to give more information than a simple abort, added httperrOutOfMemory and httperrBgException which happen while receiving and processing data in the OnDocData event and httperrSslHandShake. For range downloads, added the ContentIfRange request header which can send an RFC1123 date or Etag so a partial download only happens if the file is unchanged.

 

3 - Previously, the HTTPS REST client TSslHttpRest always downloaded content to a TMemoryStream with content size being limited to MaxBodySize (default 100 MByte), and generally restricted by memory to less than 250 MByte.  To remove this limitation, added the HttpMemStrategy property with THttpMemStrategy on how to handle downloads: HttpStratMem only TMemoryStream; HttpStratTemp uses a work file in the system temporary directory for sizes larger than MaxBodySize; HttpStratFile always writes a named file HttpDownFileName (with .part extension during download); HttpStratResume is similar to HttpStratFile but supports resume of failed partial downloads (with .http extension for resume information). Property ResumeMinSize defines the minimum sized partial file that should be resumed, rather than start again (default 64K). Added ShowProgress property that causes download information to be sent to the OnHttpRestProg event.

 

4 -The HTTP server TSslHttpServer now supports the If-Range, If-Match and If-None-Match request headers for conditional pages using Etag or last modified date, and sends 304 not modified for  matches, to help with caching.  Added an ETag header to responses in AnswerStream and AnswerPage when we can create one from a file modification date and size (base64 CRC32), or if the EntityTag property is specified in the client onGetDocument event before using hgSendDoc or hgSendStream, perhaps a CRC32 of the entire content from a cache. The 304 not modified response now includes more recommended headers. Also add a Date: header to AnswerStream and AnswerPage responses to help with caching.

 

5 - The Multi HTTPS client TIcsHttpMulti has been updated to a fix a problem that meant large files failed download with only an abort error if too large for TMemoryStream, now downloaded to TFileStream with .part extension and renamed up successful completion.

 

6 - The previous ICS release added support for the OpenSSL 3.0 release. Now it's been available for three months it has been added to the main distribution, the samples SslInternet directory now has both OpenSSL 1.1.1m and 3.0.1. ICS now supports YuOpenSSL 3.0 and 1.1.1 versions as commercial DCUs allowing applications to be used with OpenSSL without needing separate DLLs.

 

7 - In TIcsFileCopy, the DeleteFiles method now supports a new Zipped property so files are zipped with .zip extension before being deleted, useful for cleaning up old logs to save space (requires VCLZip).  The OverbyteIcsXferTst,dpr sample has a new File Clean-Up tab to test the multiple DeleteFiles method, it allow files older than x days or a specific date range to be archived/zipped (to save space) or deleted, ideal for deleting the old log files that many applications (including some ICS samples) leave on systems.

 

8 - In the FTP client TSslFtpClient, using the PORT command to set Active mode now prevents other FTP clients sharing the same port number and address, usually only a problem with a small port pool (which is not recommended).

 

9 - Updated the trusted root certificate bundle files, lots of changes from Microsoft since June, Google is now issuing it's own certificates. Updated the build-in sslRootCACertsBundle, few gone, now total 59 certificates commonly used.

 

10 - ICS should now build with C++ for RAD Studio 10.4 and 11.0, fixed the 11.0 packages and various Windows API related units, including for  Win64.

 

More detailed release notes are at http://wiki.overbyte.eu/wiki/index.php/ICS_V8.68

 

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