diff --git a/.env b/.env
index ef24219..a92a374 100644
--- a/.env
+++ b/.env
@@ -2,4 +2,7 @@ PAGE_ICON = "images/image-to-ascii-art-logo-2.png"
 PAGE_IMAGE = "images/image-to-ascii-art-logo.png"
 GITHUB_REPO = "https://github.com/WSE-research/image-to-ascii-art"
 DESCRIPTION = "\nYou want to create ASCII art from a given picture? Then you've come to the right place. This tool provides a **fast and automated** way to interactively create ASCII art from an existing image (either uploaded from your local machine or download from a URL). You might use this in your applications (e.g., in the `banner.txt` file of [Spring Boot applications](https://www.baeldung.com/spring-boot-custom-banners)). Several methods are implemented here in different approaches for convenient comparison. Some support colorized characters, or colorized background of characters, taking the colors from the given image (see [full feature list](https://github.com/WSE-research/image-to-ascii-art/#image-to-ascii-converter)). Choose for yourself the best approach regarding your image and use case. Have fun.\n\nSee the sidebar for configuring this tool's behavior. For more details, see our [GitHub repository](%s) where you can also [submit bug reports](%s) and [feature requests](%s)."
-META_DESCRIPTION = "Create fast and automated ASCII art from images. Upload images or download from a URL. Compare methods interactively, including color/background options. Ideal for applications like Spring Boot banner.txt files."
\ No newline at end of file
+META_DESCRIPTION = "Create fast and automated ASCII art from images. Upload images or download from a URL. Compare methods interactively, including color/background options. Ideal for applications like Spring Boot banner.txt files."
+REPLACE_INDEX_HTML_CONTENT = True
+CANONICAL_URL = True
+CANONICAL_URL = https://wse-research.org/image-to-ascii-art/
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index be74d06..ba6c89a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,6 +33,9 @@ ENV COLORTERM=24bit
 # set environment variables for the application
 ENV UPLOAD_DIRECTORY=/app/working_directory
 
+# do a dry run to see if the applications would starts (so, we are not surprised if it doesn't work during the real start of the container)
+RUN (export DRY_RUN=True; export UPLOAD_DIRECTORY="/app/working_directory"; streamlit run image-to-ascii-art-converter-web-ui.py &) && sleep 5 && curl http://localhost:${SERVER_PORT}/
+
 EXPOSE $SERVER_PORT
 HEALTHCHECK CMD curl --fail http://localhost:$SERVER_PORT/_stcore/health
 
diff --git a/image-to-ascii-art-converter-web-ui.py b/image-to-ascii-art-converter-web-ui.py
index 627bf5f..7382ac5 100644
--- a/image-to-ascii-art-converter-web-ui.py
+++ b/image-to-ascii-art-converter-web-ui.py
@@ -16,6 +16,7 @@
 from ansitoimg.render import ansiToSVG
 from util import include_css, download_image, save_uploaded_file, replace_values_in_index_html
 import json
+import signal
 
 UPLOAD_DIRECTORY = config('UPLOAD_DIRECTORY')
 EXPORT_IMAGE_ENDING = "-ascii-art.png"
@@ -47,6 +48,11 @@
 
 conv = Ansi2HTMLConverter()
 
+# if the dry run is enabled, we will stop the script
+if config('DRY_RUN', default=False, cast=bool):
+    logging.info("dry run enabled, will stop script, now")
+    os.kill(os.getpid(), signal.SIGTERM)
+
 ascii_image_converter_with_colors = "With colors (I)"
 ascii_image_converter_with_colors_complex = "With colors (II)"
 ascii_magic_with_colors = "With colors (III)"