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Trending Discussions on Web Framework
QUESTION
I have some Java code that is generating a socket binding. It's hard to provide a minimal example as this is part of a web framework, but it effectively does this check at some point.
...ANSWER
Answered 2022-Feb-16 at 20:18They are not binding to the same port. One is binding to TCP on top of IPv6, the other is binding to TCP on top of IPv4.
To expand on the Java details a bit: new ServerSocket(port) in Java uses InetAddress.anyLocalAddress() because no InetAddress was passed in. InetAddress.anyLocalAddress() can return either an IPv4 or IPv6 address, which means this isn't guaranteed to be the same value to bind to across JVMs despite the same port being passed in.
QUESTION
I created a django project, set up a virtual environment, and added django with poetry add.
inside pyproject.toml:
...ANSWER
Answered 2022-Jan-31 at 06:29It seems that you have manually created a virtual env in the project directory by e.g. python -m venv venv. So now you have one in /home/tesla/Documents/projects/graphql/graphenee/venv/.
After that you added some packages with poetry. However, by default poetry will only look for .venv directory (note the starting dot) in the project directory. Since poetry did not find a .venv, it created a new virtual env in /home/tesla/.cache/pypoetry/virtualenvs/graphenee-CXeG5cZ_-py3.9 and installed the packages you added via poetry add there.
The problem is that you try to use the "empty" virtual env in the project directory instead of the one created by poetry. Fortunately with poetry it is very easy to run command, even without activating the venv, just use poetry run in the project directory.
To check Django installation:
QUESTION
I was playing with some web frameworks for Python, when I tried to use the framework aiohhtp with this code (taken from the documentation):
...ANSWER
Answered 2022-Jan-28 at 10:14Picking up on the comment by @salparadise, the following worked for me:
QUESTION
I'm new using App Engine, and I would appreciate if someone can clarify this doubt:
How can I be sure that AppEngine in the cloud have the correct version of go I need to have in the cloud?
I have read some articles about installing and downloading the SDK for google on my local machine (and of course, I am able to install the version I need on my machine); but once I have generated my app in Go and I want to deploy it to App Engine in the cloud, how can I be sure Google infrastructure has the correct version?
I want to install Iris Web framework as part of the stack but it requires to go vers 1.14 or superior, Google App Engine standard only provides support for Google 1.11 and 1.12+ so I think I would need to go for the Google App Engine Flexible option, if that were the case, how can I be sure it has or support the Go version I need?... Or Is there some procedure to follow to install it ?
Thanks in advance for your support
...ANSWER
Answered 2022-Jan-03 at 21:27With the Flexible environment you have the ability to pin a version rather than using the latest available/supported. In order to do that, you will have to specify in your app.yaml file the exact version you would like it to be:
QUESTION
Is there a recommended pattern in Remix for running common code on every request, and potentially adding context data to the request? Like a middleware? A usecase for this might be to do logging or auth, for example.
The one thing I've seen that seems similar to this is loader context via the getLoadContext API. This lets you populate a context object which is passed as an arg to all route loaders.
It does work, and initially seems like the way to do this, but the docs for it say...
It's a way to bridge the gap between the adapter's request/response API with your Remix app
This API is an escape hatch, it’s uncommon to need it
...which makes me think otherwise, because
This API is explicitly for custom integrations with the server runtime. But it doesn't seem like middlewares should be specific to the server runtime - they should just be part of the 'application' level as a Remix feature.
Running middlewares is a pretty common pattern in web frameworks!
So, does Remix have any better pattern for middleware that runs before every loader?
...ANSWER
Answered 2021-Dec-01 at 15:43There is no way inside Remix to run code before loaders.
As you found out, there is the loader context but it runs even before remix starts to do its job (so you won't know which route modules are matched for example).
You can also run arbitrary code before handing the request to remix in the JS file where you use the adapter for the platform you're deploying to (this depend on the starter you used. This file doesn't exist if you've chosen remix server as your server)
For now it should work for some use cases, but I agree this is a missing feature in remix for now.
QUESTION
We are using Quart (Flask+asyncio) Python web framework. Every time the request is processed and the response is sent to a client, this (or similar) message is logged:
WARNING:asyncio:Executing wait_for=()] created at /usr/local/lib/python3.8/asyncio/base_events.py:422> cb=[_wait.._on_completion() at /usr/local/lib/python3.8/asyncio/tasks.py:518] created at /usr/local/lib/python3.8/site-packages/quart/asgi.py:46> took 2.700 seconds
Since it is WARNING, we are kind of worried about what this could be. Does anyone have any idea why a log like this appears?
Also, I have seen more logs starting before. Does anyone know what these logs are?
To replicate a similar log message, it is enough just to do this:
...ANSWER
Answered 2021-Dec-23 at 16:24asyncio and other event loops require the tasks to yield control back to the event loop periodically so that it can switch to another task and execute tasks concurrently. This warning is indicating that a task is taking a long time between yields, thereby 'blocking' the event loop.
It is likely this is happening as your code is either doing something CPU intensive, or more likely is using non-asyncio IO e.g. using requests. You should investigate this as it will degrade your servers ability to serve multiple requests concurrently.
QUESTION
I have two apps in go language. user_management app, which I run (docker-compose up --build) first, then I run(docker-compose up --build) sport_app. sport_app is dependent from user_management app.
sport_app Dockerfile file as below.
...ANSWER
Answered 2021-Dec-22 at 10:09For communicating between multiple docker-compose clients, you need to make sure that the containers you want to talk to each other are on the same network.
For example, (edited for brevity) here you have one of the docker-compose.yml
QUESTION
Sorry for a lengthy one, but I'm in dire straits - just trying to provide all details upfront.
This Fri (2021-Nov-12) after a restart of Visual Studio 2017 it began crashing without notice while opening existing solutions. This worked perfectly fine at least a week ago (after last Win10 Update KB5006670 on 2021-Nov-05 - followed by a reboot). Trying to load old solutions (which haven't been touched for 2+ years) results in exactly the same behavior:
you get a glimpse of "Loading Project .." windows (not sure if it goes through all projects in a solution), then suddenly the main VS window disappears and .. that's it.
VStudio's configuration has not been touched at least for a year. No explicit updates/patches or NuGet packages either. By itself VS starts and shows the main window with usual Start page. But I cannot load any solution or project.
The very first related Event Log entry:
...ANSWER
Answered 2021-Dec-21 at 16:18Sorry it took so long. Was under a gun to finish a project..
The root cause of the problem turned out to be ICSharpCode.CodeConverter v.8.4.1.0!
Wow, of all the pieces installed (which aren't that many)..
On a hunch (since the problem was local to Visual Studio) I started looking at Tools and Extensions, and noticed on this component the Date Installed being past the most recent Windows Update! The Automatically update this extension checkbox was checked (by default?).
So it must have silently updated upon VS restart?!
Granted, updates are useful and sometimes necessary. But they also may introduce problems. Performing updates automatically is one thing. But not informing the user about it is bad!
Here's an excerpt from the C:\TEMP\VSIXInstaller_f0335270-1a19-4b71-b74b-e50511bcd107.log:
QUESTION
I'm currently developing a Java Web application using Servlets. What I need to do is log to a file every access made to the website. To do that, I used Filters. So far, I've made it to the point where I can print everything to the console.
What I now need to do is store that into a file with a maximum of 10.000 entries up to 30 days old (if the maximum entries is achieved, the oldest ones are replaced when a new one is written).
How can I do that?
P.S: I cannot use a database for this assignment
Edit: I am not using a web framework. I can use logging frameworks.
...ANSWER
Answered 2021-Nov-04 at 02:48So, this question actually prompted me to investigate whether any of the popular logging frameworks can actually do the task as requested.
While most do rolling logs based on file size and date/time, none of them had an easy way to do a rolling log based on entries in the log file. Also, existing logging frameworks typically store each day (and sometimes smaller units of time) in their own separate file, making for efficient cleanup based on date/time.
With a requirement for a maximum number of lines inside a single file, this necessitates reading the entire file into memory (very inefficient!). When everything, past and present is being written to a single file, removing older entries requires parsing each line for the date/time that entry was written (also, inefficient!).
Below is a simple program to demonstrate that this can be done, but there are some serious problems with this approach:
- Not thread safe (if two threads try to read/write an entry simultaneously, one will be clobbered and the message will be skipped)
- Slurping is bad (ten thousand entries is a lot: can the server slurp all that into memory?)
This is probably suitable for a toy project, a demonstration, or a school assignment.
This is NOT suitable for production applications, or really anything on the web that more than one person is going to use at a time.
In short, if you try to use a handi-craft program that you found on the internet for a mission-critical application that other people depend on, you are going to get exactly what you deserve.
QUESTION
I am quite new to Javascript, I am working to extend pieces of code implemented by third parts and I have to fill in a table with data using DataTables.
contextThis table is made up of 3 columns: "nested field", "subfields blacklist", "edit", and when filled in with data should look like this:
The data to be filled in columns "nested field" and "subfields blacklist" come from the columns "nested field" and "subfields" of a Postgres database table defined as:
...ANSWER
Answered 2021-Oct-26 at 15:38SOLVED
The key data
inside each {} element of columns_nested_field variable
(which is necessary to define the title and the data that one wants to fill in the columns of the html table via DataTable)
has to have value equal to
the title of the columns of the db table containing the data that one wants to fill in the html table.
So, since in my case the data I want to fill in the html table comes from the columns nested_field, subfields of the db table testing_nested_field_blacklist ,
in the declaration of javascript variable columns_nested_field
(which is necessary to make DataTable work),
I substituted
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