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grails - 提交响应后，Grails 无法创建会话？

问题描述

我添加了一个 grails 过滤器来将带有 www 的 url 重定向到非 www url。在此更改之后，已触发了许多此类性质的错误。

更改是添加一个过滤器，如下所示

class DomainFilters {
    def filters = {
        wwwCheck(uri:'/**') {
            before = {
                if (request.getServerName().toLowerCase().startsWith("www.")) {
                    int port = request.getServerPort();

                    if (request.getScheme().equalsIgnoreCase("http") && port == 80) {
                        port = -1;
                    }

                    URL redirectURL = new URL(request.getScheme(), request.getServerName().replaceFirst("www.",""), port, request.forwardURI);

                    response.setStatus(301)
                    response.setHeader("Location", redirectURL.toString())
                    response.flushBuffer()
                }
            }
        }
    }
}

发生错误的点是

session['products-ids'] = sizes.join(",")

错误如下

ERROR 2021-07-15 13:48:48,478 [ajp-bio-8109-exec-720] errors.GrailsExceptionResolver: IllegalStateException occurred when processing request: [GET] /payment/productsPurchaseSummary/976634
Cannot create a session after the response has been committed. Stacktrace follows:
java.lang.IllegalStateException: Cannot create a session after the response has been committed
    at registration.PaymentController.productsPurchaseSummary(PaymentController.groovy:621)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

我认为原因与添加的过滤器有关，但我不确定是什么导致了无法创建会话错误。我很欣赏任何见解。谢谢！

更新：

在错误点的日志中，由于上面的过滤器，这个请求被 301 重定向。

185.191.171.18 - - [15/Jul/2021:13:48:48 -0600] "GET /payment/productsPurchaseSummary/976634 HTTP/1.1" 301 950
185.191.171.5 - - [15/Jul/2021:13:48:49 -0600] "GET /payment/productsPurchaseSummary/976634 HTTP/1.1" 200 6341

标签： grailsgrails-2.2grails-filters

解决方案

添加return false后似乎已修复它。我认为如果没有返回，那么它将继续执行控制器动作。

class DomainFilters {
    def filters = {
        wwwCheck(uri:'/**') {
            before = {
                if (request.getServerName().toLowerCase().startsWith("www.")) {


                        int port = request.getServerPort();

                        if (request.getScheme().equalsIgnoreCase("http") && port == 80) {
                            port = -1;
                        }

                        URL redirectURL = new URL(request.getScheme(), request.getServerName().replaceFirst("www.", ""), port, request.forwardURI);

                        response.setStatus(301)
                        response.setHeader("Location", redirectURL.toString())
                        response.flushBuffer()
                        return false



                }
            }
        }
    }
}

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