httpstatuses | A directory of HTTP Status Codes and code references

I have a task to convert linux curl command into a Python function. The commands itself is stright forward - it does upload a file onto a server:

It has been a while since I developed an API so bear with me. I have created a new web API in the new .NET 5.0 framework. I have tried using Hellang.Middleware.ProblemDetails nuget for my error handling middleware. Seems to be working, but I cannot get any stack trace details to show for life the me, is there something I am missing?

I can only get the following details:

{"type":"https://httpstatuses.com/404","title":"Not Found","status":404,"traceId":"00-02c4e89a990c5745bc4250cfad83d5e3-bb8c1dab98b44a44-00"}

Here is relevant code from my startup class:

I'm trying to run a scraper of which the output log ends as follows:

I'm working with Api-Platform 2.5 and Symfony 4.4 (lts).

I have discovered the API Platform and I understand that there are many "interceptors" that intercept the HTTP requests:

for GET requests: The Data Provider, The Controller, The Serialization Process and finally an "anonymous process" that's setting the response code.

for POST, PUT, PATCH, and DELETE: The serialization process, The Data Provider, The Controller, The Data Persister and finally the "anonymous process" that's setting the response code.

Here I have my Data Persister:

ProductDataPersister:

When somebody sends me a field that has too many/invalid characters, or an email thats already taken, or numbers for a first name, I have always sent back a 400 with a list of field validation errors.

Is this the right thing to do? reading through all the 400s here is starting to make me question the right way to say "I understand the data, I understand the content-type and your headers, but I can't put this in my database".

My understanding is I have the server set-up correctly. I have no errors related to imports or missing libraries. I'm using cors as this is for development. I've tried commenting out the bodyparser with the same 404 error.

But, I do get a 204 response on the server's log:

According to httpstatuses.com this means, "The server has successfully fulfilled [some] request..."

Occasionally our Postgres database crashes and it can only be solved by restarting the server. We have tried incrementing the max connections and Django's CONN_MAX_AGE. Also, I am trying to learn how to set up PgBouncer. However, I am convinced the underlying issue must be something else which is fixable.

I am trying to find what that issue is. The problem is I wouldn't know where or what to begin to look at. Here are some pieces of information:

The errors are always OperationalError: FATAL: remaining connection slots are reserved for non-replication superuser connections and OperationalError: could not write to hash-join temporary file: No space left on device. I think this is caused by opening too many database connections, but I have never managed to catch this going down live so that I could inspect pg_stat_activity and see what actual connections were active.

Looking at the error log, the same URL shows up for the most part. I've checked the nginx log and it's listed in many different lines, meaning the request is being made multiple times at once rather than Django logging the same error multiple times. All these requests are responded with 499 Client Closed Request. In addition to this same URL, there are of course sprinkled requests of other users trying to access our site.

I should mention that the logic the server processes when the URL in question is requested is pretty simple and I see nothing suspicious that could cause a database crash. However, for some reason, the page loads slowly in production.

I know this is very vague and very little to work with, but I am not used to working sysadmin, I only studied this kind of thing in college and so far I've only worked as a developer.

Nowadays, I'm reading Front-End Developer Handbook. Because I want to be successfull front-end developer. I've read Coderbyte's guide. There is also an HTTP suggestion in the article.

I researched for HTTP resources. i've found these links:

https://developer.mozilla.org/en-US/docs/Web/HTTP

http://httpwg.org/specs/

https://httpstatuses.com/

http://chimera.labs.oreilly.com/books/1230000000545/index.html

https://code.tutsplus.com/tutorials/http-the-protocol-every-web-developer-must-know-part-1--net-31177

https://code.tutsplus.com/tutorials/http-the-protocol-every-web-developer-must-know-part-2--net-31155

So, I'm looking for different resources to learn HTTP, DNS, Browsers. What are your suggestions to learn HTTP, DNS and Browsers?

The reference for this method only says what happens locally on the client, and says nothing about what it potentially sends to the server. Apparently, our server has some challenges with receiving a lot of status code 499 from us when we cancel a request, but I can't find anything about how URLSession handles cancellation. Is there a standard cancel-message over the protocol HTTP?