Thank you for your report. There are several issues here, the first is the repeated values in the 9 value case and the missing value in the 10 value case.

Can you please provide a small runnable sample with a http handler and template that demonstrate this problem so we can investigate.

Here is the link:

https://play.golang.org/p/ZUcoPCQKmK

Please copy and run on local machine with port 8080. It will print out r.Form after the button is clicked.

The above code has 2 drop down lists in the template, please copy and paste to more then 10 of them and you will see r.Form is empty.

Thanks!

Please check the error from your template executions. This is probably the
source of your error.

On Tue, 9 Feb 2016, 17:07 kyle11rd notifications@github.com wrote:

Here is the link:

https://play.golang.org/p/ZUcoPCQKmK

Please copy and run on local machine with port 8080. It will print out
r.Form after the button is clicked.

The above code has 2 drop down lists in the template, please copy and
paste to more then 10 of them and you will see r.Form is empty.

Thanks!

—
Reply to this email directly or view it on GitHub
#14272 (comment).

And the parse

On Tue, 9 Feb 2016, 17:10 Dave Cheney dave@cheney.net wrote:

Please check the error from your template executions. This is probably the
source of your error.

On Tue, 9 Feb 2016, 17:07 kyle11rd notifications@github.com wrote:

Here is the link:

https://play.golang.org/p/ZUcoPCQKmK

Please copy and run on local machine with port 8080. It will print out
r.Form after the button is clicked.

The above code has 2 drop down lists in the template, please copy and
paste to more then 10 of them and you will see r.Form is empty.

Thanks!

—
Reply to this email directly or view it on GitHub
#14272 (comment).

There are no errors from err functions. So I use "_" in this example.

@kyle11rd r.ParseForm() is returning a non-nil error that you're not checking.

https://play.golang.org/p/O0OqEkGFLI

Here I have included error checks, unfortunately no error on my side.

@kyle11rd no, you're not checking the ParseForm error, and it is not nil.

The problem is that you're reading the request body (with ParseForm) after you've written the response. You need to read first, then write.

!!!!!!!!!!!!!!!!!!!!!
You are right.. Never thought ParseForm can return this error:

http: invalid Read on closed Body

Strange that with only a few drop down lists no error is returned...