Error 414 when posting/updating via API


(Marco) #1

Hello everybody!
When trying to post or update a message whose content exceeds a certain size (the exact size I cannot detemine yet - is there a way to check this?) NGINX refuses to accept the POST or PUT requests and returns Error 414.
Is there a way to change (permanently) the default configuration delivered with the Discourse image, so that a larger payload size (at least matching the default 32000 characters in the admin settings) is accepted via API?


(Jay Pfaffman) #2

Have you checked the settings for “max post size”? There is also discussion here about increasing it.

If your posts via the API are getting cut off smaller than that, I’d be surprised.


(Marco) #3

Yep, I did. It’s currently set to the default value of 32000 characters and I’m trying to push via API a payload of about 6000 characters. I think that the error comes from NGINX and not from Discourse…


(Marco) #4

After a bit of searching online I found that the problem might be related to the size of URL of the PUT request performed when I update a post via API.
This is actually rendering ineffective the setting “max post length” in Discourse admin, currently at the default value of 32000 characters.
Would it be possible to change the nginx template matching the web server configuration with the default Discourse configuration?



(Jay Pfaffman) #5

You can change nginx settings in the yml file. You can look in the discourse_docker/templates directory for some examples.

I usually edit them in the container to debug and then apply those settings to new containers in app.yml.


(Marco) #6

Just to document what I did for future visitors, I have manually added the options suggested in the topics linked in my previous message.

client_header_buffer_size 64k;
large_client_header_buffers 4 64k;

The values might be different for other users, but they look more than enough for my needs.

These options shall be manually added to the /etc/nginx/conf.d/discourse.conf NGINX configuration file, and after having restarted nginx service in the container, the problem will be solved.

Obviously this has to be redone manually at every container rebuild, unless this setting is added to the official web templates.


(Marco) #7

One last post - the error was caused by me, hence no change to the templates is needed, at all! :expressionless:

I’m placing my API requests using the requests python library, and I was submitting the payload using parameter params=payload rather than data=payload, hence my oversized payload was handled in the “wrong” way.

I changed my call from this

r = requests.put(apiWebsite + '/posts/' + str(apiPost), params=payload)

to this

r = requests.put(apiWebsite + '/posts/' + str(apiPost), data=payload)

Sorry! :blush: