algoliasearch/src/main/java/com/algolia/search/saas/AbstractClient.java
public void setHeader(@NonNull String name, @Nullable String value) {
        if (value == null) {
            headers.remove(name);
        } else {
            headers.put(name, value);
        }
    }
public void setHeader(@NonNull String name, @Nullable String value) {
        if (value == null) {
            headers.remove(name);
        } else {
            headers.put(name, value);
        }
    }
Set an HTTP header that will be sent with every request.

@param name  Header name.
@param value Value for the header. If null, the header will be removed.