Accept-Encoding:gzip

[bsr]

Hello,

I use Google Chrome, and can see the Accept-Encoding is set

1. 
   
2. Request Headersview source
1. Accept:
   application/json, text/plain, */*
2. Accept-Charset:
   ISO-8859-1,utf-8;q=0.7,*;q=0.3
3. Accept-Encoding:
   gzip,deflate,sdch
4. Accept-Language:
   en-US,en;q=0.8
5. Cache-Control:
   no-cache
6. Connection:
   keep-alive
7. Content-Length:
   2
8. Content-Type:
   application/json;charset=UTF-8

But, the response is not gzipped. below is the server log of http header.

key: Cookie val: --

key: Origin val: --

key: User-Agent val: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.160 Safari/537.22

key: Content-Length val: 2

key: Accept val: application/json, text/plain, */*

key: Cache-Control val: no-cache

key: Connection val: close

key: X-Appengine-Inbound-Version-Id val: 1.1

key: Accept-Charset val: ISO-8859-1,utf-8;q=0.7,*;q=0.3

key: Pragma val: no-cache

key: Referer val: ---

key: X-Appengine-Inbound-Appid val: dev~slot

key: X-Requested-With val: XMLHttpRequest

key: X-Appengine-Request-Log-Id val: --

key: Content-Type val: application/json;charset=UTF-8

key: X-Appengine-Inbound-User-Id val: 

key: X-Appengine-Inbound-User-Email val: 

key: Accept-Language val: en-US,en;q=0.8

I don't see   Accept-Encoding in the  header anymore.

I see a post, https://groups.google.com/forum/?fromgroups=#!searchin/google-appengine-go/gzip/google-appengine-go/sCbckk5Jym0/MjOSQIPX-JgJ

" Other issue I've been running into is that the dev server never compresses the requests (which is inconsistent with the production server and should be regarded as a bug)."

Please let know is it indeed a bug, or not supported in dev env.

Thanks

[David Symonds]

https://developers.google.com/appengine/kb/general#compression

[bsr]

Dave. thanks for the response. I couldn't get much info from the paragraph.

Further, in the Java doc (https://developers.google.com/appengine/docs/java/runtime#Responses) it says

"Custom clients can indicate that they are able to receive compressed responses by specifying both Accept-Encoding and User-Agent headers with a value ofgzip. The Content-Type of the response is also used to determine whether compression is appropriate; in general, text-based content types are compressed, whereas binary content types are not."

I guess it only for Custom clients, and Nick clarifies it in SO post

http://stackoverflow.com/questions/8471681/appengine-gzip-compressing

So do you mean, in dev. environment doesn't support gzip or I need set user-agent.

thanks

On Wednesday, March 13, 2013 10:32:37 PM UTC-4, David Symonds wrote:

https://developers.google.com/appengine/kb/general#compression

[bsr]

Sorry, anyone please comment on what Dave implied.

thanks

[Julius Kovac]

From my experience I never saw gzipped content from dev server so I assume it is not supported (which is one of the inconsistencies why PageSpeed gives you different score).

On production environment gzip is supported but sometimes you receive gzipped response and sometimes you don't.

It is affected by the proxies between your location and appengine datacenter (when I load application from work I don't get compressed response while when I load it from home I does).

To consistently test response compression of your application on production env. you can use tool http://nontroppo.org/tools/gziptest/.

Hope it helps.

- Julius