Cannot assign requested address (localhost:xxxx) - Docker + Linux Containers - docker

Question

We have a WPF application that will call a Web API called API-1 which is running in a docker container. I also have another API called API-2 which is also running in a docker but a different container.
Whenever the API-1 call happened from the application, the API-1 will do some logic and try to do a post request to API-2.
Now, my problem is, the post request to API-2 always returns Cannot assign requested address (localhost:XXXX).
If I try without docker, it works fine.
Also, a separate request to each of the API works fine (using POSTMAN)
This problem occurs only if the API deployed in the docker. I was using docker-compose to create the containers. I have created a docker network bridge and allocated it to the respective APIs in the docker-compose.yml file.
Here is my docker-compose file as well as the docker file for both of the APIs.
Docker-Compose.yml
version: "3.7"
networks :
localdev:
name: localdev
external: true
services:
api-01:
build:
context: .
dockerfile: api-01/Dockerfile
restart: always
container_name: "api-01"
ports:
- "8082:80"
environment:
ASPNETCORE_ENVIRONMENT: "Development"
networks:
- localdev
api-02:
build:
context: .
dockerfile: api-02/Dockerfile
restart: always
container_name: "api-02"
ports:
- "8083:80"
environment:
ASPNETCORE_ENVIRONMENT: "Development"
networks:
- localdev
DockerFile(API-1)
FROM mcr.microsoft.com/dotnet/aspnet:5.0-buster-slim AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/sdk:5.0-buster-slim AS build
WORKDIR /src
COPY ["api-01/api-01.csproj", "api-01/"]
COPY ["CommonEntities/CommonEntities.csproj", "CommonEntities/"]
RUN dotnet restore "api-01/api-01.csproj"
COPY . .
WORKDIR "/src/api-01"
RUN dotnet build "api-01.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "api-01.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "api-01.dll"]
DockerFile(API-2)
FROM mcr.microsoft.com/dotnet/aspnet:5.0-buster-slim AS base
WORKDIR /app
EXPOSE 80
FROM mcr.microsoft.com/dotnet/sdk:5.0-buster-slim AS build
WORKDIR /src
COPY ["api-02/api-02.csproj", "api-02/"]
COPY ["CommonEntities/CommonEntities.csproj", "CommonEntities/"]
RUN dotnet restore "api-02/api-02.csproj"
COPY . .
WORKDIR "/src/api-02"
RUN dotnet build "api-02.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "api-02.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "api-02.dll"]
I'm not sure what I'm missing here!
I have tried most of the solutions from the internet, but nothing works.

Answer 1

It looks like I need to use {DOCKER_IP} instead of "localhost" if I want to have communication between two API in two different containers.
After I changed my post request to hit "http://{My_PC_IP_Address}:8082", the request was successful.
Thanks to David for redirecting me to the right documentation https://docs.docker.com/network/bridge/