Lot of "Illegal header" error since upgraded to Play 2.6

[Thibault Meyer]

Hello, 

since we have upgraded our application to Play 2.6.x, we got a lot of errors like :

Illegal header: Illegal 'accept-language' header: Invalid input '/', expected weight, OWS, 'EOI', listSep, ALPHA or '-' (line 1, column 12): application/json

Reporting this kind of issue is a good idea, but the message, besides being annoying, is totally useless because it dont give usefull information (like IP address or user-agent) via the message or MDC context to retrieve the applications or the developers who make non RFC compliant HTTP request.

Is it possible to add, at leat, the remote IP and the user-agent in logger MDC context or print this kind of message 

Illegal header from XXX.XXX.XXX.XXX:  'accept-language' header: Invalid input '/', expected weight, OWS, 'EOI', listSep, ALPHA or '-' (line 1, column 12): application/json

Sincerely.

[Marcos Pereira]

Hey Thibault,

This is the same as https://github.com/playframework/playframework/issues/7997 and it is also related to this discussion: https://github.com/playframework/playframework/issues/7737. I don't have an exact timeline, but we are planning to change how Play/Akka HTTP integration works wrt headers parsing (we want to be less strict in Play, for example).

Anyway, the log message you are seeing is logged by Akka HTTP itself, so maybe you want to open an issue here: https://github.com/akka/akka-http/issues

Best.

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Marcos Pereira

Software Engineer, Lightbend.com

[Thibault Meyer]

Thanks Marcos

Le lundi 15 janvier 2018 21:39:09 UTC+1, Marcos Pereira a écrit :

Hey Thibault,

This is the same as https://github.com/playframework/playframework/issues/7997 and it is also related to this discussion: https://github.com/playframework/playframework/issues/7737. I don't have an exact timeline, but we are planning to change how Play/Akka HTTP integration works wrt headers parsing (we want to be less strict in Play, for example).

Anyway, the log message you are seeing is logged by Akka HTTP itself, so maybe you want to open an issue here: https://github.com/akka/akka-http/issues

Best.

On Mon, Jan 15, 2018 at 11:27 AM, Thibault Meyer <thibaul...@payintech.com> wrote:

Hello, 

since we have upgraded our application to Play 2.6.x, we got a lot of errors like :

Illegal header: Illegal 'accept-language' header: Invalid input '/', expected weight, OWS, 'EOI', listSep, ALPHA or '-' (line 1, column 12): application/json

Reporting this kind of issue is a good idea, but the message, besides being annoying, is totally useless because it dont give usefull information (like IP address or user-agent) via the message or MDC context to retrieve the applications or the developers who make non RFC compliant HTTP request.

Is it possible to add, at leat, the remote IP and the user-agent in logger MDC context or print this kind of message 

Illegal header from XXX.XXX.XXX.XXX:  'accept-language' header: Invalid input '/', expected weight, OWS, 'EOI', listSep, ALPHA or '-' (line 1, column 12): application/json

Sincerely.

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