HTTP provides (RFC 9112) a way for sending several chunks back by a server as a response to the request. Let’s see how to communication looks like. Communication A client sends a normal request, like for example: And a server responds in several chunks like: Response structure Each chunk contains at least two parts:– size …
How to send an HTTP response in chunks? Chunked Transfer Encoding Czytaj dalej »
Dropping a role seems to be a simple thing like: but it is not… In order to drop a role you need to ensure that there are no objects bound to this role. How to unbind objects from a role? Do it for every database! What is really important while unbinding objects from a role …
There are at least two not obvious class initialization mechanisms in Python, especially if your background is in different programming languages π Class field initialization If you assign a class value outside __init__ method like here (see class_field): You should get: So be careful – class fields initialized outside __init__ are initialized only once (when …
There are only 2Β³Β² = 4,294,967,296 IP possible addresses in version 4 (IPv4) and around 8,000,000,000 people in the world. So it means that only roughly half of the citizens can have one IP address. It’s a big limitation considering at least a few devices per one person. So there are two solutions for this …
What is the difference between 127.0.0.1 and 0.0.0.0 when you bind your server to one of them? Simple answer is – 127.0.0.1 never goes outside your machine, whereas 0.0.0.0 do. 0.0.0.0 So as depicted in the picture – when your server is bound to 0.0.0.0 it means that it listens to all interfaces (traffic comming …
In a distributed architectures (like microservices or event-driven architecture) sometimes a client request requires information from more than one service and this is called workflow management. There are primarly two types: orchestration and choreography. Orchestration Orchestration means that there is one service (conductor) which takes care of the workflow process. Pros of Orchestration Cons of …
Workflow management – orchestration versus choreography Czytaj dalej »
Here I’ve listed a few characteristics (with their descriptions, if needed) which can be used while thinking about an architecture of the system: Scalability Usually it is about horizontal scalability of independent services. Elasticity If a system can scale up or down automatically. Availability It is how much time it must be available. Some systems …
Layered architecture Architectural Characteristic Star Rating Maintainability β Testability β β Deployability β Simplicity β β β β β Evolvability β Performance β β β Scalability β Elasticity β Fault Tolerance β Overal Cost β Modular monolith architecture Architectural Characteristic Star Rating Maintainability β β β Testability β β β Deployability β β β Simplicity β β β β Evolvability β β β Performance β β β Scalability β Elasticity β Fault Tolerance β Overal …
Star rating of architectural styles [Head First – Software Architecture] Czytaj dalej »
CDN stands for Content Delivery Network and it’s idea is simple – instead of serving content from one server, let’s put multiple replicas (with the same content) in different geographical places. So thanks to this an application can gain multiple benefits:– faster loading time– reduced traffic on the main server– better reliability (if one server …
To set memory limits in Java we use two arguments:-Xms – minimum (in kilobytes – k, megabytes – m or gigabytes -g)-Xmx – maximum (in kilobytes – k, megabytes – m or gigabytes -g) Example Default values Default values are set dynamically by JVM and they are usually set in the following way:-Xms -> 1/64 …
