What happens if you serve content with a different length than the Content-Length header?

content-length-size.md

@jakearchibald done a bit of research around this:

###Loading a page with Content-Length < actual content length

• Chrome: Truncated content - no indication of error
• Firefox: Truncated content - no indication of error
• Safari: Truncated content - no indication of error
• IE: Truncated content - no indication of error

###Loading a page with Content-Length > actual content length

• Chrome: Rendered received content, spinner until timeout, ERR_CONTENT_LENGTH_MISMATCH & ERR_CACHE_MISS in console
• Firefox: No in-progress render, spinner until timeout, rendered received content, no console errors
• Safari: No in-progress render, spinner until timeout, no final render, "Failed to load resource: The network connection was lost." in console
• IE: No in-progress render, spinner until timeout, rendered received content, no console errors

###Loading a page with Content-Length > actual content length ending in abrupt server termination

• Chrome: Received content rendered, ERR_CONTENT_LENGTH_MISMATCH in console
• Firefox: Received content rendered, no errors
• Safari: No content render "Safari can’t open the page “‎localhost:3000/app-name/” because the server unexpectedly dropped the connection."
• IE: Received content rendered, no errors

###Loading a page with no Content-Length, chunked encoding & abrupt server termination

• Chrome: Received content rendered, ERR_INCOMPLETE_CHUNKED_ENCODING in console
• Firefox: Received content rendered, no errors
• Safari: Received content rendered, no errors
• IE: Received content rendered, no errors

###XHR a page with Content-Length < actual content length

• Chrome: load event, truncated content
• Firefox: load event, truncated content
• Safari: load event, truncated content
• IE: load event, truncated content

###XHR a page with Content-Length > actual content length

• Chrome: waits until timeout, error event, ERR_CONTENT_LENGTH_MISMATCH in console
• Firefox: waits until timeout, load event, received content delivered
• Safari: waits until timeout, error event, "Failed to load resource: The network connection was lost." in console
• IE: waits until timeout, load event, received content delivered

###XHR a page with Content-Length > actual content length ending in abrupt server termination

• Chrome: error event, ERR_CONTENT_LENGTH_MISMATCH in console
• Firefox: load event, received content delivered
• Safari: error event, "Failed to load resource: The network connection was lost." in console
• IE: load event, received content delivered

###XHR a page with no Content-Length, chunked encoding & abrupt server termination

• Chrome: error event, ERR_INCOMPLETE_CHUNKED_ENCODING in console
• Firefox: load event, received content delivered
• Safari: load event, received content delivered
• IE: load event, received content delivered