---
layout: manual
title: Change Log
---

<h1>Change Log</h1>

<h2>4.0.2</h2>

<ul>
  <li>The exploded application is more reliably cleaned up at shutdown when running in standalone mode.</li>
  <li>KakaduNativeProcessor supports JPEG2000-compatible JPX source images.</li>
  <li>Fixed an error from KakaduDemoProcessor in Windows when using a system locale that uses characters other than periods as decimal separators.</li>
  <li>Fixed incorrect redaction positioning when scaling.</li>
  <li>Fixed an error from processors that use a Java 2D processing pipeline when attempting to scale a source image that is natively less than three pixels in either dimension, or has been cropped to that size.</li>
  <li>Fixed an empty response when image overlays are enabled but the overlay pathname or URL is invalid. Instead, images are served without the overlay, and warnings logged.</li>
  <li>Updated Jetty to version 9.4.12, which fixes a potential connection leak in long-running servers when using HttpSource. (Thanks to @giancarlobi)
  <li>Miscellaneous other dependency updates.</li>
</ul>

<h2>4.0.1</h2>

<ul>
  <li>Fixed a regression introduced in 3.4.3 that could cause URIs to appear with the wrong scheme in information responses and <code>Link</code> headers. (Thanks to @mmatela and @jweisman)</li>
  <li>Fixed a bug that caused the minimum tile size in IIIF Image API 2.x information responses to be 512 regardless of the setting of <code>endpoint.iiif.min_tile_size</code>.</li>
  <li>Fixed a connection leak in HttpSource.</li>
  <li>Improved the resiliency of the internal JPEG2000 parser used by KakaduDemoProcessor and OpenJpegProcessor.</li>
  <li>Fixed KakaduNativeProcessor's handling of <code>sizeByDistortedWidtHeight</code> requests.</li>
  <li>Removed an error message that would appear in the log when the delegate script file was not found but the delegate script was disabled.</li>
  <li>The <code>X-Forwarded-Host</code> reverse proxy header may contain a port number, which will be used if <code>X-Forwarded-Port</code> is not supplied.</li>
</ul>

<h2>4.0</h2>

<h3>Endpoints</h3>
<ul>
  <li>A new <code>X-Forwarded-ID</code> reverse proxy header replaces <code>X-IIIF-ID</code>, which has been deprecated, and will be removed in a future version.</li>
  <li>Error response representations are in <code>text/plain</code> format in the absence of a client preference.</li>
  <li>When <code>endpoint.iiif.content_disposition</code> is set to <code>inline</code>, the <code>Content-Disposition</code> header value includes a filename-safe version of the image identifier.</li>
</ul>

<h3>Sources</h3>
<ul>
  <li>Resolvers have been renamed sources to better reflect their core function.</li>
  <li>AmazonS3Resolver has been renamed S3Source, and it now supports non-AWS endpoints.</li>
  <li>S3Source supports a configurable path prefix and suffix when using <code>BasicLookupStrategy</code>.</li>
  <li>AzureStorageSource supports shared access signature (SAS) URIs. (Thanks to @ddisciascio)</li>
  <li>Improved the efficiency of source cache content access when <code>cache.server.resolve_first = false</code>.</li>
  <li>All sources fall back to checking the magic bytes in image data if they cannot infer a format any other way.</li>
</ul>

<h3>Processors</h3>
<ul>
  <li>KakaduProcessor has been renamed KakaduDemoProcessor to reflect the fact that it interfaces with the Kakadu demo tool, <span class="filename">kdu_expand</span>, and not the native library.</li>
  <li>Added KakaduNativeProcessor, as well as compiled binaries for Linux, macOS, and Windows, which are free to use with it for non-commercial purposes.</li>
  <li>Added <code>DownloadStrategy</code> as another optional retrieval strategy for stream-based processors, and as an optional fallback strategy. This enables all processors to work with all sources with no extra configuration.</li>
  <li>JPEG2000-compatible JPX images are readable by all processors that support JPEG2000.</li>
  <li>JaiProcessor has been deprecated. See the user manual for more information.</li>
  <li>KakaduDemoProcessor and OpenJpegProcessor work in Windows.</li>
  <li>KakaduDemoProcessor and OpenJpegProcessor read image metadata using custom code, which is more efficient than using the respective <span class="filename">kdu_jp2info</span> and <span class="filename">opj_dump</span> tools, and enables them to read the number of decomposition levels, which improves reliability when decoding images with less-common level counts.</li>
  <li>Image I/O plugins can be selected on a per-format basis.</li>
  <li>Improved the efficiency of the Java 2D resample filters.</li>
  <li>When using the Java 2D pipeline to downscale to less than three pixels on a side, an empty image with the correct dimensions is returned, rather than a downscaled 3&times;3 image, which is the smallest size that the Java 2D resample filters support.</li>
  <li>Java2dProcessor supports animated GIFs.</li>
  <li>Java2dProcessor supports CMYK &amp; YCCK JPEGs.</li>
  <li>Worked around some behavior of the <span class="filename">opj_decompress</span> tool that could cause OpenJpegProcessor to break. (Thanks to @adam-vessey)</li>
  <li>Improved PdfBoxProcessor's validation of requests for multi-page PDFs whose pages have inconsistent dimensions.</li>
  <li>The <code>processor.limit_to_8_bits</code> configuration option is no longer available. All output is limited to 8 bits.</li>
  <li>Disabled support for GIF source images in JaiProcessor, as it was buggy and other processors can handle GIF better.</li>
</ul>

<h3>Caching</h3>
<ul>
  <li>AmazonS3Cache has been renamed S3Cache, and it now supports non-AWS endpoints.</li>
  <li>The time-to-live of the source and derivative caches is independently configurable.</li>
  <li>The cache worker dumps the contents of HeapCache during its shifts, if both are enabled and if HeapCache persistence is also enabled.</li>
  <li>The cache worker's work interval specifies the amount of time between the end of one shift and the beginning of the next, rather between the start of one shift and the next.</li>
  <li>The deprecated <code>DELETE /cache/:identifier</code> HTTP API method has been removed.</li>
</ul>

<h3>Delegate Script</h3>
<ul>
  <li>The delegate script has been redesigned as a class that is instantiated per-request. See the "Delegate Script" section of the user manual for detailed information.</li>
</ul>

<h3>Other</h3>
<ul>
  <li>Java 10 (18.3) is supported.</li>
  <li>Updated JRuby to 9.1.17.0.</li>
</ul>

<h2>3.4.4</h2>

<ul>
  <li>Fixed a regression introduced in 3.4.3 that could cause URIs to appear with the wrong scheme in information responses and <code>Link</code> headers. (Thanks to @mmatela and @jweisman)</li>
  <li>The <code>X-Forwarded-Host</code> reverse proxy header may contain a port, which will be used if <code>X-Forwarded-Port</code> is not supplied.</li>
</ul>

<h2>3.4.3</h2>

<ul>
  <li>Updated the Jackson dependency to address the following security vulnerabilities: CVE-2018-7489, CVE-2018-5968, CVE-2017-15095.</li>
  <li>AmazonS3Resolver and AmazonS3Cache can obtain credentials from Amazon container environment variables or EC2 Instance Metadata Service.</li>
  <li>Arbitrary <code>X-Forwarded</code> headers are respected without <code>X-Forwarded-Host</code> needing to be set. (Thanks to @jweisman)</li>
  <li>Fixed a potential resource leak involving stream-based resolvers.</li>
  <li>Fixed HttpResolver's handling of semicolon-delimited <code>Content-Type</code> header values.</li>
  <li>Fixed palette corruption when cropping source images with indexed color with Java2dProcessor.</li>
  <li>Fixed a <code>NullPointerException</code> when using the info cache without a derivative cache.</li>
  <li>Other minor fixes.</li>
</ul>

<h2>3.4.2</h2>

<ul>
  <li>Fixed a leak when using HttpResolver in a Servlet container that resulted in an inability to shut down properly. (Thanks to @punkfairy)</li>
  <li>Fixed aspect-fit scale-to-height not working properly in ImageMagickProcessor and GraphicsMagickProcessor.</li>
  <li>Fixed incorrect URIs in responses when using slash substitution or URI-encoded identifiers.</li>
  <li>Efficiency improvements in AmazonS3Resolver and AzureStorageResolver.</li>
  <li><code>OutOfMemoryError</code>s during image responses are logged at error level rather than info-level.</li>
  <li>Improved the reliability of Image I/O plugin selection.</li>
  <li>Updated the PDFBox dependency to version 2.0.8.</li>
</ul>

<h2>3.4.1</h2>

<ul>
  <li>Improved efficiency when handling a request for a bitonal or gray image when the source image is already bitonal or gray. (Thanks to @adam-vessey)</li>
  <li>Fixed upscaling by percent in KakaduProcessor and OpenJpegProcessor.</li>
  <li>Efficiency improvements in PdfBoxProcessor.</li>
  <li>Improved the reliability of source cache downloading and content acquisition.</li>
  <li>Miscellaneous reliability improvements in AmazonS3Resolver and AmazonS3Cache.</li>
  <li>Server misconfigurations cause HTTP 500 (Internal Server Error) responses rather than HTTP 400 (Bad Request).</li>
</ul>

<h2>3.4</h2>

<h3>Endpoints</h3>
<ul>
  <li>HTTP/2 can be enabled in standalone mode. (h3 requires Java 9, but h3C works in Java 8.)</li>
  <li>The accept queue limit of the standalone HTTP &amp; HTTPS servers is configurable.</li>
  <li>The minimum size in IIIF Image API 2.x <code>info.json</code> responses is configurable. (Thanks to @cbeer)</li>
  <li>The maximum size in IIIF Image API 2.x <code>info.json</code> responses is the full image size, rather than half size. (Thanks to @cbeer)</li>
  <li>The IIIF Image API 1.x endpoint returns a JPEG image, rather than GIF, when no client preference is expressed in the URI or <code>Accept</code> header.</li>
  <li>Certain derivative cache errors can be recovered from without causing an error response.</li>
  <li>The <code>sizes</code> key in Image API 2.x information responses respects the <code>max_pixels</code> configuration option.</li>
  <li>Image and information endpoints return <code>HTTP 501 Not Implemented</code>, rather than <code>500 Internal Server Error</code>, when the selected processor does not support the requested source format.</li>
  <li>Image requests may include a <code>?response-content-disposition</code> query argument to suggest a response <code>Content-Disposition</code> header value.</li>
  <li>Added several HTTP API methods for cache management.</li>
  <li>Changes to HTTP Basic authorization settings in all endpoints take effect without restarting.</li>
  <li>All endpoints support the HTTP <code>OPTIONS</code> method.</li>
  <li>Status items in the Control Panel update automatically via AJAX.</li>
  <li>The username used to access the Control Panel is configurable.</li>
</ul>

<h3>Resolvers</h3>
<ul>
  <li>Miscellaneous efficiency improvements across all resolvers.</li>
  <li>The <code>HttpResolver::get_url()</code> delegate method may return a hash containing authentication credentials.</li>
  <li>Added an option to HttpResolver to trust all certificates.</li>
  <li>The request timeout of HttpResolver is configurable.</li>
  <li>AmazonS3Resolver and AzureStorageResolver attempt to infer a source format from the object/blob key if not able to do so from the identifier or from object/blob metadata.</li>
  <li>The maxmimum number of AWS connections used by AmazonS3Resolver is configurable.</li>
  <li>AmazonS3Resolver falls back to obtaining credentials from various other sources (see the user manual) when they are not set in the configuration file. (Thanks to @jweisman)</li>
  <li>Resolver delegates are passed an additional context parameter. (Thanks to @jonathangreen)</li>
</ul>

<h3>Processors</h3>
<ul>
  <li>Added an option that enables Java2dProcessor, JaiProcessor, KakaduProcessor, and PdfBoxProcessor to preserve the sample depth of &gt;8-bits-per-sample source images.</li>
  <li>GraphicsMagickProcessor and ImageMagickProcessor respect the <code>processor.dpi</code> configuration key.</li>
  <li>GraphicsMagickProcessor supports the GIF output format.</li>
  <li>ImageMagickProcessor supports image overlays.</li>
  <li>FfmpegProcessor supports FLV videos.</li>
  <li>The <code>processor.background_color</code> configuration key affects alpha blending as well as non-90&deg;-multiple rotations. (Thanks to @Algae666)</li>
  <li>ImageMagickProcessor's support for ImageMagick versions prior to 7 is deprecated.</li>
  <li>OpenJpegProcessor's support for OpenJPEG versions prior to 2.2.0 is deprecated.</li>
  <li>Improved the predictability of Image I/O plugin selection.</li>
  <li>Initialization warnings (related to missing dependencies, for example) are displayed in the Control Panel.</li>
</ul>

<h3>Caching</h3>
<ul>
  <li>Image info is written to caches asynchronously to enable faster responses.</li>
  <li>Added an optional in-memory image info cache.</li>
  <li>Added RedisCache.</li>
  <li>Added HeapCache.</li>
  <li>AmazonS3Cache uploads images to S3 asynchronously, enabling faster responses.</li>
  <li>The maxmimum number of AWS connections used by AmazonS3Cache is configurable.</li>
  <li>AmazonS3Cache falls back to obtaining credentials from various other sources (see the user manual) when they are not set in the config file. (Thanks to @jweisman)</li>
  <li>On macOS, FilesystemCache uses file last-modified times rather than last-accessed times as the latter are not reliable.</li>
</ul>

<h3>Other</h3>
<ul>
  <li>Configuration files support inheritance via an <code>extends</code> key.</li>
  <li>The temporary directory is configurable.</li>
  <li>Added an optional error log.</li>
  <li>A logger is accessible from the delegate script.</li>
</ul>

<h2>3.3.5</h2>

<ul>
  <li>Fixed FilesystemCache failing to purge invalid source images. (Thanks to @jhosteny)</li>
  <li>Fixed the <code>cache.server.resolve_first</code> configuration key always being effectively <code>true</code> in the IIIF Image API 2.x endpoint.</li>
  <li>Fixed AmazonS3Cache sometimes purging fewer objects than it should.</li>
  <li>Fixed failure to auto-purge incompletely-written images from derivative caches other than FilesystemCache in response to a VM error (such as <code>OutOfMemoryError</code>).</li>
  <li>HttpResolver makes fewer HTTP requests.</li>
</ul>

<h2>3.3.4</h2>

<ul>
  <li>Fixed an <code>AbstractMethodError</code> in HTML views, caused by a regression in 3.3.3.</li>
  <li>Fixed the <code>X-IIIF-ID</code> header not being respected when redirecting from <code>/:identifier</code> to <code>/:identifier/info.json</code> in both IIIF Image API endpoint versions. (Thanks to @jonathangreen)</li>
</ul>

<h2>3.3.3</h2>

<ul>
  <li>Added Java 9 compatibility.</li>
  <li>Upgraded dependencies to fix the following vulnerabilities: CVE-2015-6420. (Thanks to @kinow)</li>
  <li>Fixed incorrect computation of post-rotation bounding boxes, manifesting as bogus values passed to the <code>resulting_size</code> delegate method arguments. (Thanks to @SaschaAdler)</li>
  <li>Fixed a warning from FilesystemCache when multiple processes tried to create the same directory at the same time. (Thanks to @cbeer)</li>
  <li>Fixed potentially incorrect tile sizes in information responses when using OpenJpegProcessor.</li>
  <li>Fixed a bug in FfmpegProcessor that caused video info parsing to fail for some videos.</li>
  <li>Added <code>Origin</code> to all <code>Vary</code> response headers, which fixes a potential CORS-related caching issue.</li>
  <li>Fixed an issue where certain Image I/O plugins could fail to register when multiple applications that use Image I/O are running in the same container. (Thanks to @mmatela)</li>
  <li>Fixed a resource leak when using image overlays.</li>
  <li>Improvements in the testing and build process. (Thanks to @kinow)</li>
</ul>

<h2>3.3.2</h2>

<ul>
  <li>Fixed an inefficiency that caused image metadata to be read multiple times in a single image response.</li>
  <li>Fixed endpoint authentication being enabled for certain non-endpoint resources.</li>
  <li>Impoved compatibility between OpenJpegProcessor and OpenJPEG when using OpenJPEG version 2.2.0 or later. (Thanks to @RussellMcOrmond)</li>
  <li>Fixed inability to stream source images when using AmazonS3Resolver.</li>
  <li>Fixed a potential HTTP 500 error when multiple processes try to write the same image metadata concurrently using FilesystemCache.</li>
  <li>Corrected the documentation for <code>processor.upscale_filter</code> and <code>processor.downscale_filter</code>.</li>
  <li>GraphicsMagickProcessor and ImageMagickProcessor support a <code>?page</code> query argument with PDFs.</li>
</ul>

<h2>3.3.1</h2>

<ul>
    <li>Fixed caches failing to take URL query arguments into account.</li>
    <li>Fixed a potentially incorrect <code>Cache-Control</code> header being sent in HTTP &ge; 400 responses.</li>
    <li>Fixed parsing of comma-separated <code>X-Forwarded-*</code> header values.</li>
    <li>Improved the reliability of the value of the <code>client_ip</code> argument to the <code>authorized?()</code> delegate method when behind a reverse proxy.</li>
    <li>Fixed a connection leak in AmazonS3Resolver.</li>
    <li>Fixed potential malformed concurrent image responses when using a processor other than ImageMagickProcessor or GraphicsMagickProcessor.</li>
    <li>Fixed a potential NullPointerException (HTTP 500) involving concurrent requests when using the delegate script.</li>
    <li>Fixed processors and caches not respecting the value of <code>processor.normalize</code>.</li>
    <li>Prevented the configuration file and/or delegate script from being reloaded twice on some platforms.</li>
    <li>Fixed PDF source format support in GraphicsMagickProcessor and ImageMagickProcessor.</li>
    <li>Upgraded JRuby to 9.1.10.0.</li>
</ul>

<h2>3.3</h2>

<h3>Endpoints</h3>
<ul>
  <li>Auto-computed tile sizes of source images with an odd number of pixels in a dimension in information responses are rounded up, to prevent clients from requesting extremely narrow edge tiles.</li>
  <li>Operations that would have no effect in their context&mdash;for example, a crop to 0,0/300&times;200, followed by a scale-to-fit to 300 pixels wide&mdash;are skipped.</li>
  <li>Improved request validation.</li>
  <li>Added a RESTful API endpoint to retrieve and update the configuration.</li>
</ul>

<h3>Processors</h3>
<ul>
  <li>Most processor-specific configuration settings now apply across all processors, making them integrate better into the caching architecture.</li>
  <li>Added an auto-normalize option to all image processors.</li>
  <li>Added an option to all processors to output progressive JPEGs.</li>
  <li>Added experimental support for DICOM images to GraphicsMagickProcessor, ImageMagickProcessor, Java2dProcessor, and JaiProcessor. (This is a very complex format and not all variants are working.)</li>
  <li>FfmpegProcessor uses a Java 2D processing pipeline, giving it more capabilities.</li>
  <li>Java2dProcessor and JaiProcessor support 16-bit LZW- and ZIP-compressed TIFFs.</li>
  <li>GraphicsMagickProcessor and ImageMagickProcessor support selectable resample filters.</li>
  <li>GraphicsMagickProcessor and ImageMagickProcessor respect the EXIF Orientation tag.</li>
  <li>ImageMagickProcessor supports ImageMagick 7.</li>
  <li>PdfBoxProcessor supports JBIG2-encoded embedded images.</li>
  <li>PdfBoxProcessor returns HTTP 400 when given an illegal page number.</li>
  <li>FfmpegProcessor returns HTTP 400 when given an illegal time.</li>
</ul>

<h3>Caching</h3>
<ul>
  <li>The <code>-Dcantaloupe.cache.purge</code> VM option accepts an identifier argument to purge all content related to an individual identifier.</li>
  <li>Added a RESTful API endpoint to purge individual images from the cache.</li>
  <li>A <code>cache=false</code> URL query option can be used in all endpoints to bypass the derivative cache and disable the <code>Cache-Control</code> header per-request.</li>
  <li>FilesystemCache supports identifiers longer than the filesystem's filename length limit.</li>
</ul>

<h3>Overlays</h3>
<ul>
  <li>Watermarks have been renamed overlays.</li>
  <li>Added textual overlays.</li>
  <li>Overlay images can be located on the filesystem or an HTTP(S) server.</li>
  <li>Overlay images are cached in memory for better efficiency.</li>
</ul>

<h3>Delegate Script</h3>
<ul>
  <li>Added an optional delegate method invocation cache.</li>
  <li>Added the ability to redirect to another URL via the <code>authorized?()</code> delegate method.</li>
  <li>The delegate script is reloaded on change rather than per-request.</li>
</ul>

<h2>3.2.4</h2>

<ul>
  <li>Fixed all processors except JaiProcessor treating scale-to-dimensions requests (<code>w,h</code>) as scale-to-fit (<code>!w,h</code>).</li>
  <li>Fixed a bug affecting upscaled crops when using pyramidal images with Java2dProcessor or JaiProcessor.</li>
  <li>Worked around a bug in JAI involving downscaling of compressed TIFF tiles, affecting JaiProcessor.</li>
</ul>

<h2>3.2.3</h2>

<ul>
  <li>Fixed inability to upscale in JaiProcessor, omitted in error from 3.2.2.</li>
  <li>Fixed incorrect scale size computation using flooring instead of rounding.</li>
  <li>Fixed a bug in FilesystemCache that could cause an HTTP 500 error when accessing the same uncached <span class="filename">info.json</span> resource concurrently.</li>
  <li>FilesystemCache cleans up zero-byte files created in certain situations, typically involving failure in the underlying storage.</li>
  <li>Fixed a bug that could cause incompletely-written cached images (with any cache) to not get cleaned up properly.</li>
</ul>

<h2>3.2.2</h2>

<ul>
  <li>Fixed inability to upscale by pixels.</li>
  <li>Fixed an error in response to requests for images less than 3 pixels on a side when sharpening is enabled, in all processors using the Java 2D pipeline.</li>
  <li>Fixed an error in JaiProcessor when attempting to scale an image less than 3 pixels on the smallest side.</li>
  <li>Fixed a bug in FilesystemCache that caused zero-byte files to be written and an HTTP 500 response when handling concurrent identical requests.</li>
  <li>Error responses include a more appropriate <code>Cache-Control</code> header rather than the one set in the configuration.</li>
  <li>Trailing slashes in <code>X-Forwarded-Path</code> header values are trimmed off, preventing double-slashes from appearing in generated URLs.</li>
</ul>

<h2>3.2.1</h2>

<ul>
  <li>Fixed a bug that caused the resolver selected by the <code>get_resolver()</code> delegate method to not be initielized properly.</li>
  <li>Fixed a path-handling bug affecting ImageMagickProcessor and GraphicsMagickProcessor primarily in Windows.</li>
  <li>Fixed incorrect image sizes when using FfmpegProcessor with percentage scales above 100%.</li>
  <li>Improved support for 16-bit source images in Java2dProcessor, JaiProcessor, GraphicsMagickProcessor, and ImageMagickProcessor.</li>
</ul>

<h2>3.2</h2>

<ul>
  <li>Java 8 is now required.</li>
  <li>Significant efficiency improvements in the Java 2D processing pipeline affecting Java2dProcessor, JaiProcessor, and KakaduProcessor.</li>
  <li>All processors that use the Java 2D pipeline (Java2dProcessor, KakaduProcessor, OpenJpegProcessor, PdfBoxProcessor) support selectable upscaling and downscaling filters.</li>
  <li>Improved the scale quality of JaiProcessor.</li>
  <li>All processors offer configurable sharpening levels.</li>
  <li>Applicable processors respect source ICC color profiles.</li>
  <li>Added the option to copy EXIF, IPTC IIM, XMP, and/or native TIFF and PNG metadata from source images to derivative images of the same format, for some processors.</li>
  <li>Java2dProcessor and JaiProcessor respect the value of an embedded EXIF Orientation tag.</li>
  <li>Increased the default Java2dProcessor/JaiProcessor JPEG quality to 0.8 (80).</li>
  <li>Added support for a <code>X-IIIF-ID</code> request header, in order to return correct image identifiers in information responses whose requests have passed through a reverse proxy using a different identifier.</li>
  <li>Removed the JAI post-processor option for KakaduProcessor and OpenJpegProcessor.</li>
  <li>Zero-byte files are deleted when purging or cleaning FilesystemCache.</li>
  <li>KakaduProcessor and OpenJpegProcessor display a less inscrutable error message when they are unable to read a source file.</li>
  <li>HTTP 415 is returned instead of HTTP 400 when an output format is requested that is valid but unsupported by the current processor.</li>
  <li>Colorized the console application log.</li>
  <li>Console application log messages with a severity of <code>WARN</code> and above are routed to standard error.</li>
  <li>Upgraded a number of libraries.</li>
</ul>

<h2>3.1.2</h2>

<ul>
  <li>Fixed a resource leak that would cause landing pages, error pages, and the Control Panel to become inaccessible after a long time running.</li>
  <li>Fixed a bug where the watermark wouldn't be added if redactions were enabled and set to use <code>DelegateScriptStrategy</code> but the delegate script was disabled.</li>
  <li>Fixed tile sizes in the IIIF Image API 2.x information response when using KakaduProcessor.</li>
  <li>HTTP 400 is returned in response to a request for an image that would be zero pixels on a side, even when the zero dimension is not explicit in the request. (For example, a size of <code>4,</code> for an image that is at least five times wider than it is tall.) (Previously, it was only returned when zero pixels was explicitly requested, and the image returned for implicit zero sizes was incorrect.)</li>
</ul>

<h2>3.1.1</h2>

<ul>
  <li>Added the <code>http.host</code> and <code>https.host</code> standalone mode configuration options, defaulting to listen on <code>0.0.0.0</code> (all interfaces).</li>
</ul>

<h2>3.1</h2>

<ul>
  <li>Added support for version 2.1 of the IIIF Image API.
    <ul>
      <li>Added support for the <code>square</code> region parameter to all processors.</li>
      <li>Added the <code>max</code> size parameter.</li>
      <li>Removed the information request <code>Link</code> header for the JSON-LD context.</li>
      <li>Added the <code>sizeByConfinedWh</code> and <code>sizeByDistortedWh</code> feature names, supported by all processors.</li>
      <li>Added the <code>maxArea</code> property to the profile description, based on the value of the <code>max_pixels</code> configuration key.</li>
    </ul>
  </li>
  <li>Replaced the <code>get_iiif2_service</code> delegate method with <code>extra_iiif2_information_response_keys</code>.</li>
</ul>

<h2>3.0.1</h2>

<ul>
  <li>Fixed a broken build in standalone mode.</li>
</ul>

<h2>3.0</h2>

<ul>
  <li>Added a Control Panel for web-based configuration changes.</li>
  <li>Changed the distribution archive to a custom <span class="filename">.war</span> file that can be run standalone (as before) or in a Servlet container.</li>
  <li>Added AmazonS3Cache.</li>
  <li>Added AzureStorageCache.</li>
  <li>Added redaction.</li>
  <li>Added the ability to restrict available sizes to those specified in the <span class="filename">info.json</span> response in the IIIF Image API 2.0 endpoint.</li>
  <li>Added an optional source image cache, which can improve the performance of StreamProcessors, as well as enable FileProcessors to work with StreamResolvers.</li>
  <li>Moved JdbcResolver delegate methods to the delegate script.</li>
  <li>Moved resolver-related delegate methods to submodules to improve organization.</li>
  <li>Changes to the logging configuration are applied immediately without restarting.</li>
  <li>Requests for more than <code>max_pixels</code> receive an HTTP 403 response rather than 500.</li>
  <li>Upgraded the Amazon S3 client to version 1.10.56.</li>
  <li>Upgraded the Restlet framework to version 2.3.7.</li>
</ul>