{"id":344,"date":"2025-04-02T00:54:59","date_gmt":"2025-04-02T03:54:59","guid":{"rendered":"http:\/\/desarrollo-agil.com\/blog\/?p=344"},"modified":"2025-04-03T01:17:04","modified_gmt":"2025-04-03T04:17:04","slug":"log-request-response-spring","status":"publish","type":"post","link":"http:\/\/52.201.184.187\/blog\/experiencias\/log-request-response-spring\/","title":{"rendered":"Loggear request y response con spring en kotlin"},"content":{"rendered":"\n

Necesitaba loggear el body del request recibido y el body del response retornado por una serie de controllers en una aplicaci\u00f3n hecha con kotlin y Spring, y me encontr\u00e9 con que no hay mucha documentaci\u00f3n al respecto, lo que dio inicio a este art\u00edculo. <\/p>\n\n\n\n

Si bien spring nos deja acceder al request f\u00e1cilmente, inyectando el par\u00e1metro al controller, la mayor dificultad con la que nos vamos a topar es que el request solamente lo vamos a poder leer 1 vez. Para salvar esta dificultad vamos a usar las clases ContentCachingRequestWrapper<\/strong> y ContentCachingResponseWrapper<\/strong>, que van a envolver el request original y van a cachear el contenido. <\/p>\n\n\n\n

ContentCachingRequestWrapper solamente va a tener disponible el body una vez que este se haya le\u00eddo, y a partir de ese momento se podr\u00e1 acceder las veces que sea necesario. Para esto nos tenemos que asegurar que al momento de acceder a su body alguien (spring) haya le\u00eddo el request. <\/p>\n\n\n\n

Para lograr esto nos vamos a valer de un Filter<\/strong>, con el que vamos a insertar nuestros wrappers en medio de la cadena de ejecuci\u00f3n. <\/p>\n\n\n\n

Ver ejemplo completo: https:\/\/github.com\/emilianotebes\/spring-log-request-response-demo<\/a><\/p>\n\n\n\n

La clase principal es LoggingFilter:<\/p>\n\n\n\n

class LoggingFilter : Filter {\n\n    override fun doFilter(\n        req: ServletRequest,\n        res: ServletResponse,\n        filterChain: FilterChain\n    ) {\n        \/\/ Tenemos que castear los requests\n        val castedRequest = req as HttpServletRequest\n        val castedResponse = res as HttpServletResponse\n\n        \/\/ Envolvemos los request en nuestros wrappers\n        val wrappedRequest = ContentCachingRequestWrapper(castedRequest)\n        val wrappedResponse = ContentCachingResponseWrapper(castedResponse)\n\n        try {\n            \/\/ Invocamos al resto de las operaciones para asegurarnos de que tanto el request como el response se lean y escriban\n            \/\/ Notar que mandamos los wrappers, y no los objetos originales\n            filterChain.doFilter(wrappedRequest, wrappedResponse)\n        } finally {\n            \/\/ Una vez ejecutado filterChain, tenemos nuestro objetos cargados con la info\n            val contentAsString = wrappedRequest.contentAsString\n            val responseAsString = String(wrappedResponse.contentAsByteArray)\n\n            \/\/ Obligatoriamente tenemos que hacer esto, porque la conexi\u00f3n est\u00e1 establecida con el response original\n            \/\/ y nuestro filter chain escribi\u00f3 en una copia, si no ponemos esta l\u00ednea el body del response ser\u00e1 vac\u00edo\n            wrappedResponse.copyBodyToResponse()\n\n            \/\/ Podemos acceder a los valores las veces que querramos\n            println(\"Request: $contentAsString\")\n            println(\"Response: $responseAsString\")\n\n        }\n\n    }\n}<\/code><\/pre>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Necesitaba loggear el body del request recibido y el body del response retornado por una serie de controllers en una aplicaci\u00f3n hecha con kotlin y Spring, y me encontr\u00e9 con que no hay mucha documentaci\u00f3n al respecto, lo que dio inicio a este art\u00edculo. Si bien spring nos deja acceder al request f\u00e1cilmente, inyectando el\u2026 Leer m\u00e1s »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,38],"tags":[36,96],"yoast_head":"\nLoggear request y response con spring en kotlin - Desarrollo \u00c1gil Log request response con spring<\/title>\n<meta name=\"description\" content=\"Explicaci\u00f3n y proyecto de ejemplo para lograr imprimir en log el body del request recibido y el response retornado en un Controller de Spring\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/52.201.184.187\/blog\/experiencias\/log-request-response-spring\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Loggear request y response con spring en kotlin - 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