How Do I Bypass SSL Certificate Errors in Apache HttpClient 4.0?

Ignoring SSL Certificate Errors in Apache HttpClient 4.0

Apache HttpClient is a popular Java library for performing HTTP requests. However, when working with SSL-protected websites, it can be necessary to bypass invalid SSL certificate errors. This is especially useful for testing or when using self-signed certificates.

Solution

In Apache HttpClient 4.3 and later, you can use the AllowAllHostnameVerifier to ignore hostname verification when building an HTTP client. Here's how:

CloseableHttpClient httpClient = HttpClients
    .custom()
    .setHostnameVerifier(new AllowAllHostnameVerifier())
    .build();

For versions 4.4 and later, use the following syntax:

CloseableHttpClient httpClient = HttpClients
    .custom()
    .setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE)
    .build();

This code will create a new HTTP client that accepts all hostnames and ignores any SSL certificate errors.

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