NetTalk Central
NetTalk Web Server => Web Server - Share Knowledge => Topic started by: random69 on December 05, 2008, 09:20:00 AM
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Just wanted to share this. Basically wanted a way to server up ANY file and have the user save/open it.
Basically, you have to send a different header than what NT sends.
Create a new web page, and set the header to other. Uncheck Send Header.
Then put the code below under Processed Code, Priority 500 (must be 500, before calling the header routine).
! set our content type
lCT = 'application/x-download'
! send custom header
packet = 'HTTP/1.0 200 OK<13,10>' & |
'Content-Type: ' & CLIP(lCT) & '<13,10>' & |
'Content-Disposition: attachment; filename=' & CLIP(lFN) & '<13,10>' & |
'<13,10>'
do sendpacket
! send it
p_web._SendFile(lFileName,NET:NoHeader)
! return without footer
return
Obviously, you have to setup lFilename as the full filename to download - remember security issues too. (I get the filename using GetValue, validate the login and location of the file is ok).
lCT is the content type - set to x-download
lFN is the filename only
FYI - The 'content-disposition' header tag is what causes the dialog box to show up on the browser, allowing the user to save or open the file.
You could also modify the content type and remove the disposition based on the extension of the file.
You might want to add other header tags to deal with caching, dates, etc - but this appears to work for me at this time the way it is.
BRUCE: It would be VERY COOL to setup utility functions to change/add header tags before sending the header out. Take a look at the header() function within PHP.
Also - unchecking the "Send HTTP Header" doesn't work - that's why the code above has to be at priority 500.
Hope this helps to other people....
Cheers!
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Hi
yes, I think you'll find an example of this in the FileDownload example.
cheers
Bruce
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Hi Bruce,
I'm on 4.29 - but apparently you are aware of this already based on other topics on content-disposition. I won't upgrade until things stabilize anyhow.
Did you include a way to change content-disposition in later builds? For that matter - any way of changing the actual header?
Thanks.
Dave
Hi
yes, I think you'll find an example of this in the FileDownload example.
cheers
Bruce
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I was wondering guys, how would you do the type change to Other in a Net web Form...?
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Hi Npa,
you wouldn't need to I don't think because
a) I'm not sure why you'd want the user to "save" the netwebform rather than view it and
b) you don't need to set the content-type to set the content-disposition.
Cheers
Bruce
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Hi Dave,
>> Did you include a way to change content-disposition in later builds? For that matter - any way of changing the actual header?
You've got more-or-less complete control of the header.
There's a property of the web handler class called HeaderDetails (Group).
In this property are a bunch of strings -
HTTP string(2048) ! e.g HTTP/1.0
ResponseNumber string(3) ! e.g. 200
_Spacer1 string(1) !
ResponseString string(80) ! e.g. OK
Date long ! Clarion Date Long
Time long ! Clarion Time Long
ExpiresDate long ! Clarion Date Long
ExpiresTime long ! Clarion Time Long
LastModifiedDate long ! Clarion Date Long
LastModifiedTime long ! Clarion Time Long
ETag string(80) ! e.g. "8dc33a162a5c41:e8c"
Age string(40) ! e.g 6374 (age in seconds). number between 0 and 2147483648
ContentLength string(40) ! bytes in the Body (not including the header)
ContentType string(80) ! e.g. text/html; charset=ISO-8859-4 or text/xml ! was 40
CacheControl string(256)! e.g. No-Cache or <blank> or max-age=900
_Pragma string(40) !
Server string(40) ! Server Description e.g. Apache or Microsoft-IIS/5.0 etc.
Location string(1024)
WWWAuthenticate string(80)
Cookies String(2048)
Connection string(40) ! e.g. close
ContentEncoding string(40) ! e.g. gzip
ContentDisposition string(256) ! e.g. 'Content-Disposition: attachment; filename="employees.csv"
Thus, in the handler you can override pretty much any of the header contents at more or less any time. (There are some specific exceptions - where the classes specifically set header options, but then all you need to do is set it _after_ the class does.)
Cheers
Bruce