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From: =?UTF-8?Q?Philippe_Le_H=c3=a9garet?= <plh@w3.org>
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Date: Sun, 24 Nov 2019 15:27:44 -0500
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Subject: [Ietf-message-headers] Permanent message header field registration for traceparent and tracestate
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I'd like to update two entries from provisional to permanent.

Header field name: traceparent
Applicable protocol: http
Status: permanent
Change Controller:
   Distributed Tracing Working Group
   https://www.w3.org/2018/distributed-tracing/
   public-trace-context@w3.org
Specification:
   https://www.w3.org/TR/trace-context/#traceparent-field

Header field name: tracestate
Applicable protocol: http
Status: permanent
Change Controller:
   Distributed Tracing Working Group
   https://www.w3.org/2018/distributed-tracing/
   public-trace-context@w3.org
Specification:
   https://www.w3.org/TR/trace-context/#tracestate-field


Thank you,

Philippe


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From: Julian Reschke <julian.reschke@gmx.de>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ietf-message-headers/uJqG0UGmFnrgJ24XALoYm7l46Ck>
Subject: Re: [Ietf-message-headers] Permanent message header field registration for traceparent and tracestate
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On 24.11.2019 21:27, Philippe Le H=C3=A9garet wrote:
> I'd like to update two entries from provisional to permanent.
>
> Header field name: traceparent
> Applicable protocol: http
> Status: permanent
> Change Controller:
>  =C2=A0 Distributed Tracing Working Group
>  =C2=A0 https://www.w3.org/2018/distributed-tracing/
>  =C2=A0 public-trace-context@w3.org
> Specification:
>  =C2=A0 https://www.w3.org/TR/trace-context/#traceparent-field
> ...

The spec link's anchor doesn't work for me.
<https://www.w3.org/TR/trace-context/#traceparent-header> does, though.

Quoting:

> 3.2 Traceparent Header
>
> The traceparent HTTP header field identifies the incoming request in a t=
racing system. It has four fields:
>
>     version
>     trace-id
>     parent-id
>     trace-flags

So what is the actual syntax of the header field?

Best regards, Julian


From nobody Sun Nov 24 12:46:48 2019
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From: =?UTF-8?Q?Philippe_Le_H=c3=a9garet?= <plh@w3.org>
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Subject: Re: [Ietf-message-headers] Permanent message header field registration for traceparent and tracestate
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On 11/24/2019 3:39 PM, Julian Reschke wrote:
> The spec link's anchor doesn't work for me.
> <https://www.w3.org/TR/trace-context/#traceparent-header> does, though.

Didn't check and realize the links had changed. Here is an updated template:

[[
Header field name: traceparent
Applicable protocol: http
Status: permanent
Change Controller:
   Distributed Tracing Working Group
   https://www.w3.org/2018/distributed-tracing/
   public-trace-context@w3.org
Specification:
   https://www.w3.org/TR/trace-context/#traceparent-header

Header field name: tracestate
Applicable protocol: http
Status: permanent
Change Controller:
   Distributed Tracing Working Group
   https://www.w3.org/2018/distributed-tracing/
   public-trace-context@w3.org
Specification:
   https://www.w3.org/TR/trace-context/#tracestate-header
]]

> Quoting:
> 
>> 3.2 Traceparent Header
>>
>> The traceparent HTTP header field identifies the incoming request in a 
>> tracing system. It has four fields:
>>
>>     version
>>     trace-id
>>     parent-id
>>     trace-flags
> 
> So what is the actual syntax of the header field?

It's mentioned in the section
[[
[...]
   The tracestate field value is a list of [list-members] separated by 
[commas].

[...]

list  = list-member 0*31( OWS "," OWS list-member )
list-member = key "=" value
list-member = OWS

[...]

key = lcalpha 0*255( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )
key = ( lcalpha / DIGIT ) 0*240( lcalpha / DIGIT / "_" / "-"/ "*" / "/" 
) "@" lcalpha 0*13( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )
lcalpha    = %x61-7A ; a-z

[...]

value    = 0*255(chr) nblk-chr
nblk-chr = %x21-2B / %x2D-3C / %x3E-7E
chr      = %x20 / nblk-chr
]]
https://www.w3.org/TR/trace-context/#tracestate-header-field-values

Philippe


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Subject: Re: [Ietf-message-headers] Permanent message header field registration for traceparent and tracestate
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On 24.11.2019 21:46, Philippe Le H=C3=A9garet wrote:
>
>
> On 11/24/2019 3:39 PM, Julian Reschke wrote:
>> The spec link's anchor doesn't work for me.
>> <https://www.w3.org/TR/trace-context/#traceparent-header> does, though.
>
> Didn't check and realize the links had changed. Here is an updated
> template:
>
> [[
> Header field name: traceparent
> Applicable protocol: http
> Status: permanent
> Change Controller:
>  =C2=A0 Distributed Tracing Working Group
>  =C2=A0 https://www.w3.org/2018/distributed-tracing/
>  =C2=A0 public-trace-context@w3.org
> Specification:
>  =C2=A0 https://www.w3.org/TR/trace-context/#traceparent-header
>
> Header field name: tracestate
> Applicable protocol: http
> Status: permanent
> Change Controller:
>  =C2=A0 Distributed Tracing Working Group
>  =C2=A0 https://www.w3.org/2018/distributed-tracing/
>  =C2=A0 public-trace-context@w3.org
> Specification:
>  =C2=A0 https://www.w3.org/TR/trace-context/#tracestate-header
> ]]
>
>> Quoting:
>>
>>> 3.2 Traceparent Header
>>>
>>> The traceparent HTTP header field identifies the incoming request in
>>> a tracing system. It has four fields:
>>>
>>> =C2=A0=C2=A0=C2=A0 version
>>> =C2=A0=C2=A0=C2=A0 trace-id
>>> =C2=A0=C2=A0=C2=A0 parent-id
>>> =C2=A0=C2=A0=C2=A0 trace-flags
>>
>> So what is the actual syntax of the header field?
>
> It's mentioned in the section
> [[
> [...]
>  =C2=A0 The tracestate field value is a list of [list-members] separated=
 by
> [commas].
>
> [...]
>
> list=C2=A0 =3D list-member 0*31( OWS "," OWS list-member )
> list-member =3D key "=3D" value
> list-member =3D OWS
>
> [...]
>
> key =3D lcalpha 0*255( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )
> key =3D ( lcalpha / DIGIT ) 0*240( lcalpha / DIGIT / "_" / "-"/ "*" / "/=
"
> ) "@" lcalpha 0*13( lcalpha / DIGIT / "_" / "-"/ "*" / "/" )
> lcalpha=C2=A0=C2=A0=C2=A0 =3D %x61-7A ; a-z
>
> [...]
>
> value=C2=A0=C2=A0=C2=A0 =3D 0*255(chr) nblk-chr
> nblk-chr =3D %x21-2B / %x2D-3C / %x3E-7E
> chr=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D %x20 / nblk-chr
> ]]
> https://www.w3.org/TR/trace-context/#tracestate-header-field-values

I see. I'd propose to improve the paragraph ordering :-).

The ABNF currently says:

> list  =3D list-member 0*31( OWS "," OWS list-member )
> list-member =3D key "=3D" value
> list-member =3D OWS

That's invalid, you can't define "list-member" twice; make it:

list  =3D list-member 0*31( OWS "," OWS list-member )
list-member =3D (key "=3D" value) / OWS

or simpler:

list  =3D #31 list-member
list-member =3D key "=3D" value

There's also a problem that the ABNF does not allow whitespace around
"=3D", but the prose does.

Best regards, Julian


From nobody Mon Nov 25 01:32:29 2019
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Subject: Re: [Ietf-message-headers] Permanent message header field registration for traceparent and tracestate
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On 11/25/2019 12:52 AM, Julian Reschke wrote:
> I see. I'd propose to improve the paragraph ordering :-).

Sure. Fyi, I raised this at
  https://github.com/w3c/trace-context/issues/364

Thank you for catching this.

Philippe

