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
