Forwarded Without Question: How Web Frameworks Overtrust the Forwarded Header
Some web frameworks and servers, including Rails, Spring and Jetty, read values from the Forwarded request header in their default configuration. Most reverse proxies, CDNs and middleware servers do not touch the Forwarded header in requests. As a result, Forwarded headers set in untrusted requests will get passed on through proxies to the web applications, which may then consider the header tr...
Quick read
A technical blog post explaining how some web frameworks and servers trust the Forwarded HTTP header by default, allowing untrusted client-supplied values to be interpreted by applications. It shows how this can enable client IP, host name, and protocol spoofing and recommends configuring proxies and apps to agree on trusted headers and drop untrusted ones.
- Forwarded can replace X-Forwarded-* but is not widely adopted
- Frameworks (Rails, Spring, Jetty) may parse Forwarded by default
- Configure proxies and apps to drop or validate untrusted proxy headers
Reactions
No reactions yet. Record a short about this link and it shows up here, in Reels and in the community feed.
Is lkoskela.fi your site? Sign in to verify it and get a Verified badge, full stats and a link-back badge.
What we found on this site
- Served through
- GitHub Pages
- Home page answered in
- 145 ms
- Trackers
- None found
- Ads
- None found
- RSS feed
- No
- AI crawlers
- Lets them in
- Set up for phones
- Yes
- Real-visitor speed
- Not enough visitors for Google data
- Popularity
- Top 200,000 domain (Cloudflare)
- Google safety check
- No threats found
- Domain registered
- 2023
- Domain renews
- September 2027
Checked November 8, 2026 from the site’s own code and public records. See how the rest of the web compares in the NexURLs Internet Report.
Sites like Forwarded Without Question
- Security Headerssecurityheaders.com
- Iframes That Fit Their Contentalfy.blog
This site discusses a new CSS feature for iframes that allows them to automatically adjust their height based on...
- CVE-2026-106173: FortiSIEM gRPC Path Traversal to RCEhorizon3.ai
A Horizon3 research deep-dive describing CVE-2026-106173, a FortiSIEM gRPC vulnerability that allows unauthenticated...
- Remote Code Execution Vulnerability in Googlesimonkoeck.com
This site details a remote code execution vulnerability found in Google’s Flask session cookies. It provides insights...
- Breaking the open web won't stop the bad botstechpolicy.press
An opinion piece arguing that laws forcing web crawlers to identify themselves would harm legitimate, public-interest...
- How HTTPS Workshowhttps.works
A webcomic that explains HTTPS through characters like Certificat and Browserbird. It teaches why HTTPS matters for...
More Tech & AI finds
- Amutable Foundations: A Technical Overviewamutable.com
- Two Dimensional Version Controlredblobgames.com
- mygo-music: A native music player you extend with pluginsgithub.com
- IG vs GEN | WORLDS 2026 | Semis Day 1youtube.com
- This AI tool just turned me into a GAME DEVELOPER I built a FULLY PLAYABLEworkbuddy.ai
- Found this site on Reddit. It does a great job visualizing AI concepts!claudeblueprint.in
Feeling lucky? Try the random website generator.
Where people went next
Nobody has added a next stop yet. Be the first.