amazon web services – AWS – ELB HTTP traffic limitation

I am running a pretty standard LAMP stack in AWS. ELB distributes traffic to a few instances of EC2 that run the same application.

I have a problem in which I periodically receive a large increase in HTTP traffic from some of my clients. Is there any way (through WAF or something of this nature) to establish regulatory limits? Something similar to if IP X performs 1000 requests in 1 minute to stop traffic from them for a period of time & # 39 ;?

Keep in mind that it is not possible to know in advance the full range of IP of my client, so a solution must be dynamic.

Any guidance on a best practice approach to this problem would be very grateful.

Lottie by Airbnb: Innovation or limitation for designers?

Lottie by Airbnb- What do you think about this animation tool? Have you already tried it?

If you think about trying it and want to know more about applications to create animations Then, in this article, you can find useful information about the pros and cons of using Lottie and how you can help him 🙂


Lottie By Airbnb: Innovation or limitation for designers?

Lottie is a native library of iOS, Android and React that presents animations of After Effects in real time. Lottie allows engineers to create richer animations without the rewrite overload. Do you want to know more about applications to create animations? Then this article is for U))

Have you already worked with him?

Ubuntu 19.04 Changes in multiple monitors could not be saved, could be a limitation of the hardware

I have a Raedon Tahiti HD 7090 – fully compatible hardware. When I try to configure my screens I can not apply the changes because "Changes can not be applied" "This could be due to hardware limitations". All the screens show the background image, but only one is active. I'm trying to convert Windows where this was not a problem.

javascript – Limitation of 6 applications followed in ajax

Hello, I'm doing an application where I make an ajax request to make a record in the bank, the request is working without problems. But I realized that it only accepts up to 6 requests in a row without updating the page after this the server blocks. I am using the nodemon server running on gulp.js

I wonder if this is a standard limitation of the ajax or the browser?

Is it possible to parameterize to increase the number of applications followed or decrease?

Here is the ajax petition

                () () () () ()
let date = $ (& # 39; # form-student & # 39;). serialize ();
console.log (data);

const register = $ .ajax ({
method: "post", "
url: "/ students / register / save",
dataType: "json",
date: date

register.done ((answer) => {
console.log (answer)

return false;

Controller that records data / students / register / save

                module.exports = () => {
return {
register: (req, res) => {
Date =
In this case,
In this case,
(in English): parseInt (req.body.turma_id)


console.log (data)

Aluno.create ({
AL_IDAD: data.age,
AL_OBS: data.obs,
AL_TURMA: fecha.turma

res.status (201)


The application is working only to know about the limitation of the application for curiosity purposes and future projects

dnd 5e – How would you unbalance the gameplay to eliminate the limitation "requires a free hand to charge" for hand crossbows?

I am working on statistics for the royal guards of a home capital, using the Captain Guard as a template. I gave them a hand crossbow and the feat of Crossbow Expert, thinking that it would allow them to hold a shield in one hand and a crossbow in the other.

Crossbow expert mentions in PHB p. 165:

You ignore the load quality of the crossbows. with which you are competent.

• Being less than 5 feet from a hostile creature does not impose disadvantages on your ranged attacks.

• When you use the Attack and attack action with a one-handed weapon, you can use an additional action to attack with a hand crossbow that you have.

At first I thought that would be enough to use a shield while attacking with a hand crossbow, but the Loading the property actually says:

Due to the time required to load this weapon, you can fire only one piece of ammunition when you use an action, bonus action or reaction to shoot it, regardless of how many attacks you can normally do.

So "load" refers to the loading speed, and the feat makes you faster. Is the Ammunition property that, by RAW (PHB page 146), does not allow to hold a shield while attacking and reloading a hand crossbow:

[…] Removing ammunition from a quiver, box or other container is part of the attack (You need a free hand to load a weapon with one hand.). […]


How to unbalance the game to eliminate the limitation "requires a free hand to charge" for hand crossbows? Thematically, it makes sense, because in my environment this city is rich enough to have a technology as sophisticated as the "semi-automatic" hand crossbows (however, that would work). Given that my world configuration allows it, it would be fair if it were also an option for PCs, if they acquire that type of weapon and / or training. I am more interested in the combination of shield and crossbow hand, but if I forget other possible feats that could unbalance the game, inform me.

I'm fine with allowing it for NPCs (for my guards) because I can calculate the new CR, based on an increase in DPR and AC. As DM I have enough control to maintain that Balanced on the table. By allowing it for PC. although fine, I'm not sure what unbalanced farms I might be overlooking. A good response includes an analysis of the mechanical costs and benefits for PCs when the limitation "requires a free hand to load" is removed.

To eliminate this limitation, I am thinking of three possible ways:

  1. Adjust the ownership of hand-held crossbows munitions specifically.
  2. Adding a feature to the Crossbow Expert feat.
  3. Solve it through magic by making the extravagant crossbows of the royal guard unusual magical weapons that can be recharged without having a free hand.

A surprising answer includes an analysis of the balance of the game in these possible solutions as well.

Is there any limitation to attack while you fight?

I tried to look in other publications about my question, but I could not find a definitive answer to my question.

  • If a level 5 barbarian equipped with a 2-handed weapon attempts a fight and succeeds, will the additional attack feature allow an attack with the 2-handed weapon?
  • The next turn of the barbarian is approaching, can he still make 2 weapon attacks without breaking the hook?

The rules for the fight establish that whoever starts the fight needs at least one free hand, so it has been confusing for me …

ddos – Public API security: authentication vs. speed limitation, etc.

We are creating a SaaS product that allows companies to configure and organize the sale of a certain class of products / services. This product has an API in its core and an ecosystem of several applications around it. These include web applications (sites) that face the general public, a web-based CMS and an iOS application for sales people. Our customers can use them or create their own applications to talk with our API.

There has been a long debate among us about how the API should be secured. It has authentication (key / secret API for applications and user name / password for users) and authorization based on roles / permissions. At the moment, you can not get a useful API response (apart from its version) unless the requestor authenticates. This includes the endpoints that return data that is available to the general public, such as the list of items for sale.

The moot point is whether the API should require authentication for what are essentially public data.

The arguments for authentication:

  • We can not simply keep the API open for whoever calls it, even if they can get the information anyway by exploiting public web applications. An open API can be subject to abuse or attacked cargo. It is better to control who has access when issuing keys / secrets by client application, which will be the first line of defense.

The arguments against authentication:

  • It does not make sense to restrict access to what is publicly available anyway (through public access web applications that have a key / secret with the "public" role incorporated in them);
  • Making the required authentication does not add value and only generates unnecessary overhead by requiring public applications to implement authentication clients, maintain keys / secrets and update authentication tokens. Applications should only authenticate against the API when a user needs to login (which some clients simply do not need since they use the guest payment process);
  • Any abuse problem (for example, exceeding the limit of the request rate, load attacks, etc.) must be addressed by the DDoS protection layer, API internally, or both. Authentication is not the appropriate protection, since a malicious client could obtain the credentials of the application and create problems for the API anyway, not to mention that the rate of authentication attempts should also be limited.

Is any of the two previous positions horribly incorrect or would you laugh if you were to appear in the API market? Is there a correct approach here, or are both approaches sensible in terms of security and could they be selected based on other considerations such as the convenience / ease of implementation?

sharepoint online – Content query limitation limit

In my SharePoint Online, I have a content query web element that I have configured to show 5 recent elements of a subsite and sorted by Modified but I do not get any results and the error message appears over the limit of queries limitation (probably because the Total items on the site is more than 5k). I am aware that the query will not work if the total number of items to consult is more than 5k, however, it works when I ask in a specific library with more than 5k items. Here is my case and the test cases:

Subsite 1:

  • Library 1 (4k articles)
  • Library 2 (2k articles)

Subsite 2:

Subsite 3:

Test cases

  1. Query Subsite 1 = No results
  2. Query Subsite 2 = No results
  3. Query Subsite 3 = Show results
  4. Query Library 1 = Show results
  5. Query Library 3 = Show results

I am confused now as to how the query can run against a library with 8k elements but I can not execute the query against a site with a total of more than 5k elements.

c – Limitation of frames in an SDL game

I'm a relatively newbie programmer and I'm taking steps in graphics programming. I'm writing a quick pong clone and I want to limit the FPS to save system resources. This is how I implemented it (I omitted another code for brevity)

#include "SDL.h"
#include "Windows.h"
# define SPF 30

Uint32 starttime, endtime, deltatime;

int main ()
// initialize SDL and do other things
// start the game loop
timeBeginPeriod (1);
starttime = GetTickCount ();
SDL_PollEvent (& event);
if (event.type == SDL_QUIT)
SDL_DestroyRenderer (renderer);
SDL_DestroyWindow (window);
SDL_Quit ();
appisrunning = false;
// render things here
endtime = GetTickCount ();
if (endtime> starttime)
deltatime = endtime - starttime;
else // is responsible for wrapping
deltatime = ((2 ^ 32) - start time) + end time;
if (deltatime> (1000 / FPS)) {}
Sleep ((1000 / FPS) - deltatime);
timeEndPeriod (1);
returns 0;

Use timeBeginPeriod (1) in an effort to give Sleep () a resolution of ~ 1 ms. According to the MSDN documentation, this function establishes the resolution of the timer throughout the system and can result in greater CPU usage, since the programmer has to change the tasks more frequently (if I understand it correctly).

Is this the right approach to this task? What comments do you have for me?