Hi Tim,

Thanks for the suggestion - will open an issue then.

Agustina

On Wednesday, 5 July 2023 at 19:09:00 UTC+1 DSpace Technical Support wrote:

> Hi Agustina,
>
> I'd recommend adding your feedback on signposting limiting the Links to a 
> bug ticket in https://github.com/DSpace/DSpace/issues  That way I can 
> find a volunteer to look into options.
>
> In the meantime, I also wanted to note that it **is possible to turn 
> Signposting off entirely** (if it's causing a headache right now).   See 
> the "Enabling/Disabling" section here: 
> https://wiki.lyrasis.org/display/DSDOC7x/Signposting
>
> Signposting currently is *on* by default, but you are welcome to turn it 
> off for now.  There is no major risk in doing so at this time, unless you 
> require the Signposting feature for an integration with an external service.
>
> Tim
>
> On Saturday, July 1, 2023 at 9:28:02 AM UTC-5 Agustina Martinez-Garcia 
> wrote:
>
>> Some updates:
>>
>> It turns out that if using mod_proxy, the setting to change is 
>> *responsefieldsize. 
>> *It needs adding to the *ProxyPass* of the apache configuration, e.g. 
>>
>> ProxyPass / http://localhost:4000/ responsefieldsize=12392
>>
>> In case it helps others seeing the same issue. Increasing this to a very 
>> large number does not seem like a very secure option. Would it be possible 
>> for the signposting feature to include a configuration setting to limit the 
>> number of links added to the header?
>>
>> Best,
>>
>> Agustina 
>>
>> On Saturday, 1 July 2023 at 15:05:48 UTC+1 Agustina Martinez-Garcia wrote:
>>
>>> Hi all,
>>>
>>> We are testing the upgrade to DSpace 7.6. We have Apache in front of 
>>> dspace UI and have started seeing "bad gateway" errors when accessing 
>>> items. This happens mostly with items with a large number of files 
>>> (bitstreams) associated with them The example item we are using here has 
>>> more 500 files. The errors we see in Apache logs are:
>>>
>>> [Sat Jul 01 14:52:38.800373 2023] [proxy_http:warn] [pid 4123617] (28)No 
>>> space left on device: [client 172.22.88.64:0] AH10124: header size is 
>>> over the limit allowed by ResponseFieldSize (8192 bytes). Bad response 
>>> header: 'Link: <
>>> https://dev-www.repository.cam.ac.uk/bitstreams/cbaf36e9-[...] ; 
>>> rel="item" ; type="audio/mpeg" , <https://dev-www.repository.'
>>>
>>> [Sat Jul 01 14:52:38.800435 2023] [proxy_http:warn] [pid 4123617] 
>>> [client 172.22.88.64:0] AH01106: bad HTTP/1.1 header returned by 
>>> /items/f5eff2ac-3208-4e90-96ee-14cd68e8d1ac (GET)
>>>
>>> I have tried increasing the apache setting as per guidance: 
>>> https://httpd.apache.org/docs/2.2/mod/core.html#limitrequestfieldsize 
>>> but the issue still persists.
>>>
>>> I can also confirm that when disabling signposting, the issue disappears.
>>>
>>> Anyone experiencing the same behaviour?
>>>
>>

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