# Pdf files on same server don't show onebox with subdomain url
**URL:** https://meta.discourse.org/t/pdf-files-on-same-server-dont-show-onebox-with-subdomain-url/100472
**Category:** Support
**Created:** [10월 25, 2018, 4:13오후 UTC](https://meta.discourse.org/t/pdf-files-on-same-server-dont-show-onebox-with-subdomain-url/100472 "2018-10-25T16:13:32Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Rocancourt](https://meta.discourse.org/u/Rocancourt)
#### Post date: [10월 25, 2018, 4:13오후 UTC](https://meta.discourse.org/t/pdf-files-on-same-server-dont-show-onebox-with-subdomain-url/100472/1 "2018-10-25T16:13:32Z")
Hi,
Firstly, congratulation for this open source project.
I want make clean display for local pdf files with onebox. I saw that is not to possible with attachment, so i link pdf files from url on same server.
With or without whitelist internal hosts, That work with domains but i don’t see onebox for pdf files from subdomains url (my discourse url is on a subdomain). For my tests, All domains/subdomains redirect on the same server.
(_On test screen, only domains display onebox_)
I have read some posts about this, but i don’t understand the problem :
> [@Internal URL no longer oneboxing](https://meta.discourse.org/t/internal-url-no-longer-oneboxing/64208):
>
> At some point in the last 2 days internal URLs stopped oneboxing on my instance. I’m up to date with tests-passed as of 1:15 AM EST 6/9/17. There are the errors I’m seeing in the console when a post with an internal URL is loaded. There do not appear to be any related errors in /logs.
[https://meta.discourse.org/t/onebox-domains-whitelist-and-subdomains/40884](https://meta.discourse.org/t/onebox-domains-whitelist-and-subdomains/40884)
How i can fix it ?
Thanks,
PS : Link work for subdomain, i can see pdf file, that’s just display problem for onebox on content.
---
### Author:  [@Rocancourt](https://meta.discourse.org/u/Rocancourt)
#### Post date: [10월 25, 2018, 7:16오후 UTC](https://meta.discourse.org/t/pdf-files-on-same-server-dont-show-onebox-with-subdomain-url/100472/2 "2018-10-25T19:16:19Z")
I have search in the code,
```
def self.external_onebox(url)
Rails.cache.fetch(onebox_cache_key(url), expires_in: 1.day) do
fd = FinalDestination.new(url, ignore_redirects: ignore_redirects, ignore_hostnames: blacklisted_domains, force_get_hosts: force_get_hosts)
uri = fd.resolve
return blank_onebox if uri.blank? || blacklisted_domains.map { |hostname| uri.hostname.match?(hostname) }.any?
options = {
cache: {},
max_width: 695,
sanitize_config: Sanitize::Config::DISCOURSE_ONEBOX
}
options[:cookie] = fd.cookie if fd.cookie
if Rails.env.development? && SiteSetting.port.to_i > 0
Onebox.options = { allowed_ports: [80, 443, SiteSetting.port.to_i] }
end
r = Onebox.preview(uri.to_s, options)
{ onebox: r.to_s, preview: r&.placeholder_html.to_s }
end
```
I think the problem is here, no mention for the whitelist ?
` return blank_onebox if uri.blank? || blacklisted_domains.map { |hostname| uri.hostname.match?(hostname) }.any?`
> **[pdf.pdf](https://www.pdf995.com/samples/pdf.pdf)**
>
> 423.82 KB
This link don’t work too, https can be is the problem ?
Thanks,
---
### Author:  [@Rocancourt](https://meta.discourse.org/u/Rocancourt)
#### Post date: [10월 26, 2018, 6:06오후 UTC](https://meta.discourse.org/t/pdf-files-on-same-server-dont-show-onebox-with-subdomain-url/100472/3 "2018-10-26T18:06:05Z")
Finally, the subdomain without https is the problem.
My post is resolved 🙂
---
### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [10월 26, 2018, 6:35오후 UTC](https://meta.discourse.org/t/pdf-files-on-same-server-dont-show-onebox-with-subdomain-url/100472/4 "2018-10-26T18:35:23Z")