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/NetworkingInternet/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"/?
Thanks in advance.
Regards,
Jack...
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