httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/HttpAsyncClientBuilder.java [1079:1103]:
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        if (execInterceptors != null) {
            for (final ExecInterceptorEntry entry: execInterceptors) {
                switch (entry.position) {
                    case AFTER:
                        execChainDefinition.addAfter(entry.existing, entry.interceptor, entry.name);
                        break;
                    case BEFORE:
                        execChainDefinition.addBefore(entry.existing, entry.interceptor, entry.name);
                        break;
                    case REPLACE:
                        execChainDefinition.replace(entry.existing, entry.interceptor);
                        break;
                    case FIRST:
                        execChainDefinition.addFirst(entry.interceptor, entry.name);
                        break;
                    case LAST:
                        // Don't add last, after HttpAsyncMainClientExec, as that does not delegate to the chain
                        // Instead, add the interceptor just before it, making it effectively the last interceptor
                        execChainDefinition.addBefore(ChainElement.MAIN_TRANSPORT.name(), entry.interceptor, entry.name);
                        break;
                }
            }
        }

        customizeExecChain(execChainDefinition);
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httpclient5/src/main/java/org/apache/hc/client5/http/impl/classic/HttpClientBuilder.java [1027:1051]:
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        if (execInterceptors != null) {
            for (final ExecInterceptorEntry entry: execInterceptors) {
                switch (entry.position) {
                    case AFTER:
                        execChainDefinition.addAfter(entry.existing, entry.interceptor, entry.name);
                        break;
                    case BEFORE:
                        execChainDefinition.addBefore(entry.existing, entry.interceptor, entry.name);
                        break;
                    case REPLACE:
                        execChainDefinition.replace(entry.existing, entry.interceptor);
                        break;
                    case FIRST:
                        execChainDefinition.addFirst(entry.interceptor, entry.name);
                        break;
                    case LAST:
                        // Don't add last, after MainClientExec, as that does not delegate to the chain
                        // Instead, add the interceptor just before it, making it effectively the last interceptor
                        execChainDefinition.addBefore(ChainElement.MAIN_TRANSPORT.name(), entry.interceptor, entry.name);
                        break;
                }
            }
        }

        customizeExecChain(execChainDefinition);
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