Retrofit responses are delayed to full ConnectionTimeout of

2023-12-13 18:22

I met a strange issue: after switching my app to use a new API all responses to API requests arrive after exactly the connection timeout i set in the OkHttpClient.Builder().

The backend server has a similar setup as the one i used before. When i do the request from another client (postman, browser (even on the same phone)) there is no such a delay.

And when i route the traffic through a local Charles proxy then the request also performs normal.

I have currently no idea what's going on here.

API calls are done with

retrofit2 2.9 okhttp 4.11.0 rxjava2 2.0.1

On a Pixel6 API 34 but happens on all devices

other answer :

The issue youre facing, where Retrofit responses are delayed until the full ConnectionTimeout of OkHttpClient, can be caused by various factors. Here are some steps to troubleshoot and potential solutions:

Network Inspection: Use network inspection tools like Charles Proxy, Wireshark, or Androids built-in Network Profiler to analyze the network traffic. Check if there are any unexpected delays or issues at the network level.

Check Server Response Time: Verify the response time of your server when receiving requests. If possible, log the server-side processing time for the requests. This will help you determine if the delay is occurring on the server side.

Connection Pooling: Ensure that your OkHttpClient is configured with proper connection pooling settings. Connection pooling can help reduce the overhead of establishing new connections for each request.

javaOkHttpClient.Builder() .connectionPool(new ConnectionPool()) // Other configurations .build();

Interceptors: Review any interceptors you have added to your OkHttpClient. Interceptors can affect the request/response processing time. Temporarily remove them to see if they are causing the delay.

DNS Configuration: If your backend server is accessed using a domain name, check the DNS configuration. Slow DNS resolution can cause delays. Consider using a direct IP address in your Retrofit base URL for testing.

Logging: Enable logging in Retrofit and OkHttpClient to get more information about the request and response. This can help you identify where the delay is occurring.

javaHttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor(); loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY); OkHttpClient.Builder() .addInterceptor(loggingInterceptor) // Other configurations .build();

Timeouts: Double-check and ensure that you havent set excessively long timeouts in OkHttpClient. Long timeouts can lead to delays in receiving responses.

javaOkHttpClient.Builder() .connectTimeout(30, TimeUnit.SECONDS) .readTimeout(30, TimeUnit.SECONDS) .writeTimeout(30, TimeUnit.SECONDS) // Other configurations .build();

Update Libraries: Ensure that you are using the latest versions of Retrofit, OkHttp, and RxJava. Library updates may include bug fixes that could resolve your issue.

gradleimplementation com.squareup.retrofit2:retrofit:2.x.y implementation com.squareup.okhttp3:okhttp:4.x.y implementation io.reactivex.rxjava2:rxjava:2.x.z

Test on Different Network: Try testing your app on a different network to see if the issue persists. Network conditions can sometimes be the cause of unexpected delays.

Device-Specific Issues: Test on different devices and Android versions to rule out any device-specific issues. The Pixel 6 running API 34 is just one configuration, and the problem might be specific to it.

By systematically going through these steps, you should be able to identify the root cause of the delay in Retrofit responses.