When does app engine serialise the http response?

[b...@soliduslink.com]

Hi,

I am trying to set the headers on the http response but realised in some cases the http response has been serialised and the setHeader() function will fail. When exactly does app engine serialise the http response?

Best,

Baojun

[John Clute]

It looks like a signed Character problem,  It is expecting a value under 127, if it were a unsigned character the ORD value up is 0 to 255, would be OK, 0xE2 converts to 226 Decimal.  The interpreter may be defaulting to a signed characters in this version.  So you may want to force it to make characters variables unsigned.

[MyKellySue]

John,

 

If you like I can forward this to them or maybe you should email them directly. ??? Because it is your work.

 

Kelly

 

Sent from Mail for Windows 10

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[George (Cloud Platform Support)]

Hello Baojun, 

How did you determine that response headers are serialized at an unexpected moment? If this happens in some cases, would you be able to indicate which such cases have you been faced with? How can one reproduce this serialized header situation? You may refer to the documentation, in particular the "Request responses" sub-chapter of the "Request Headers and Responses" online document. 

[Baojun Xu]

Hi,

I have a Filter to add a HTTPONLY flag on the JSESSIONID cookie, where I got the following exception. Just wondering how do I add the flag before the response is committed.

[INFO] GCLOUD: java.lang.IllegalStateException: Response has already been committed

[INFO] GCLOUD: at com.google.appengine.repackaged.com.google.common.base.Preconditions.checkState(Preconditions.java:501)

[INFO] GCLOUD: at com.google.appengine.tools.development.ResponseRewriterFilter$ResponseWrapper.checkNotCommitted(ResponseRewriterFilter.java:627)

[INFO] GCLOUD: at com.google.appengine.tools.development.ResponseRewriterFilter$ResponseWrapper.reset(ResponseRewriterFilter.java:606)

[INFO] GCLOUD: at com.google.appengine.tools.development.jetty9.StaticFileUtils.passConditionalHeaders(StaticFileUtils.java:121)

[INFO] GCLOUD: at com.google.appengine.tools.development.jetty9.LocalResourceFileServlet.doGet(LocalResourceFileServlet.java:175)

[INFO] GCLOUD: at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)

[INFO] GCLOUD: at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

Best,
Baojun

On Wed, Jun 6, 2018 at 8:57 PM, 'George (Cloud Platform Support)' via Google App Engine <google-a...@googlegroups.com> wrote:

Hello Baojun, 

How did you determine that response headers are serialized? If this happens in some cases, would you be able to indicate which such cases have you been faced with? How can one reproduce this serialized header situation? You may refer to the documentation, in particular the "Request responses" sub-chapter of the "Request Headers and Responses" online document. 

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Baojun Xu

Tel: +41 79 791 78 99

SolidusLink AG

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[George (Cloud Platform Support)]

How do you set your JSESSIONID cookie? How do you use response.setHeader() in your code? A relevant sample of your code is needed, to be able to examine and eventually reproduce the issue. You may send this via private message, to maintain the desired level of privacy. 

This discussion group is oriented more towards general opinions, trends and issues of general nature touching the app engine. For coding and programming architecture, you may be better served in a forum such as stackoverflow, where experienced programmers are within reach and ready to help.