On Wed, 2018-08-22 at 16:57 +0200, Jack van Ooststroom wrote:
> Hello,
>
> We started using HttpClient 5 in order for us to communicate with
> Apple's APNs service which requires the usage of HTTP/2. However, we
> are
> currently running into an issue with the "apns-collapse-id" header.
> According to the specification
> (https://developer.apple.com/library/archive/documentation/Networking
> Internet/Conceptual/RemoteNotificationsPG/CommunicatingwithAPNs.html)
> :
>
> /"APNs requires the use of HPACK (header compression for HTTP/2),
> which prevents repeated header keys and values. APNs maintains a
> small dynamic table for HPACK. To help avoid filling up the APNs
> HPACK table and necessitating the discarding of table data,
> encode
> headers in the following way—especially when sending a large
> number
> of streams:/
>
> * /The :path value should be encoded as a literal header field
> without indexing/
> * /The authorization request header, if present, should be
> encoded
> as a literal header field without indexing/
> * /The appropriate encoding to employ for the apns-id,
> apns-expiration, and apns-collapse-id request headers differs
> depending on whether it is part of the initial or a
> subsequent
> POST operation, as follows:/
> o /The first time you send these headers, encode them with
> incremental indexing to allow the header names to be
> added
> to the dynamic table/
> o /Subsequent times you send these headers, encode them as
> literal header fields without indexing/
>
> /Encode all other headers as literal header fields with
> incremental
> indexing. For specifics on header encoding, see
> tools.ietf.org/html/rfc7541#section-6.2.1 and
> tools.ietf.org/html/rfc7541#section-6.2.2."/
>
> When setting headers on a SimpleHttpRequest, how can we
> differentiate
> between /"... //encode them with incremental indexing..."/ and /"...
> //encode them as literal header fields without indexing"/?
>
Use `sensitive` attribute on the request header to ensure its literal
encoding of the header when transmitted over an HTTP/2 connection.
Oleg
-
To unsubscribe, e-mail: httpclient-users-unsubscr...@hc.apache.org
For additional commands, e-mail: httpclient-users-h...@hc.apache.org
