---
name: "Plack::Middleware::ContentLength"
section: "3pm"
platform: "linux"
package: "libplack-perl"
version: "1.0051-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Plack::Middleware::ContentLength"
---

# Plack::Middleware::ContentLength(3pm)

Adds Content-Length header automatically

## NAME

Plack::Middleware::ContentLength - Adds Content-Length header automatically

## SYNOPSIS

```
  # in app.psgi
  builder {
      enable "Plack::Middleware::ContentLength";
      $app;
  }
  # Or in Plack::Handler::*
  $app = Plack::Middleware::ContentLength->wrap($app);
```

## DESCRIPTION

Plack::Middleware::ContentLength is a middleware that automatically adds `"Content-Length"` header when it's appropriate i.e. the response has a content body with calculable size (array of chunks or a real filehandle).

This middleware can also be used as a library from PSGI server implementations to automatically set `"Content-Length"` rather than in the end user level.

## AUTHOR

Tatsuhiko Miyagawa

## SEE ALSO

Rack::ContentLength