当我调用由WSO2 API管理器在WSO2 ESB中实现的API时，为什么要获得这种奇怪的行为？(“接受:应用程序/json”标题问题)
当我调用由WSO2 API管理器在WSO2 ESB中实现的API时，为什么要获得这种奇怪的行为？(“接受:应用程序/json”标题问题)
提问于 2018-04-17 14:23:54
我在WSO2 API管理器中非常新，在旧的WSO2 API管理器版本1.9.0上注册一些API (使用WSO2 ESB组件实现)遇到了以下问题。
问题是：
我在API管理器上注册了一个API，并在try it工具中生成并执行了如下所示的请求：
curl -X GET --header "Accept: application/json" --header "Authorization: Bearer c86b19dac9dfd7406ebe9013373c9de9" "https://api.MY-COMPANY.org/api/dsa2/v1.0.0/market/12?lang=1"此请求被发送到表示ESB实现的端点(我在日志中看到它)。这个ESB实现包含一个脚本中介，它对API将返回给用户的JSON对象执行一些操作。
为了清楚起见，我附加了API的代码：
<?xml version="1.0" encoding="UTF-8"?>
<api context="/market" name="market_details" xmlns="http://ws.apache.org/ns/synapse">
<resource methods="GET" protocol="http" uri-template="/{marketId}?lang={lang_id}">
<inSequence>
<log level="full"/>
<property expression="get-property('uri.var.marketId')" name="marketId" scope="default" type="STRING"/>
<property expression="get-property('uri.var.lang_id')" name="lang_id" scope="default" type="STRING"/>
<log level="custom">
<property expression="$ctx:marketId" name="Market ID"/>
<property expression="$ctx:lang_id" name="Lang ID"/>
</log>
<property name="messageType" scope="axis2" type="STRING" value="application/xml"/>
<payloadFactory media-type="xml">
<format>
<ds:GetMarketDetails xmlns:ds="http://ws.wso2.org/dataservice">
<ds:market_id>$1</ds:market_id>
<ds:language_id>$2</ds:language_id>
</ds:GetMarketDetails>
</format>
<args>
<arg evaluator="xml" expression="$ctx:marketId"/>
<arg evaluator="xml" expression="$ctx:lang_id"/>
</args>
</payloadFactory>
<header name="Action" scope="default" value="urn:GetMarketDetails"/>
<call>
<endpoint key="agrimarketprice_Endpoint"/>
</call>
<property name="messageType" scope="axis2" type="STRING" value="application/json"/>
<property expression="json-eval($.)" name="JSONPayload" scope="default" type="STRING"/>
<script language="js"><![CDATA[var log = mc.getServiceLog();
// Problem is: null values returned from DSS as @nil=true and converted as Object into JSON.
// See https://wso2.org/jira/browse/ESBJAVA-4467 as example of bug, reported into JIRA
// So, we need convert values, what may be nulls with using this function
function checkForNull(value) {
if (value instanceof Object && "@nil" in value) {
return null;
}
return value;
}
// stange workaround for getting JSON Payload. getPayloadJSON returned null.
var pl_string = mc.getProperty("JSONPayload");
log.info("PAYLOAD STRING: " + pl_string);
var payload = JSON.parse(pl_string);
// create new response
var response = payload.Markets.Market;
//log.info("RESPONSE: " + JSON.stringify(response));
//response.id = mc.getProperty("MarketId");
response.id = mc.getProperty("marketId");
// convert null values
response.id = checkForNull(response.id);
response.regione = checkForNull(response.regione);
response.province = checkForNull(response.province);
response.city = checkForNull(response.city);
response.district = checkForNull(response.district);
response.town = checkForNull(response.town);
response.village = checkForNull(response.village);
if(response.commodities && response.commodities.commoditiesList) {
// convert array of commodities into required HATEOS format
var commodity = new Array();
for (i = 0; i < response.commodities.commoditiesList.length; ++i) {
var el = response.commodities.commoditiesList[i];
var newEl = new Object();
newEl.commodity_details_id = checkForNull(el.commodity_details_id);
newEl.commodity_name_en = checkForNull(el.commodity_name_en);
newEl.commodity_name = checkForNull(el.commodity_name);
newEl.description = checkForNull(el.description);
newEl.image_link = checkForNull(el.image_link);
newEl.market_commodity_details_id = checkForNull(el.market_commodity_details_id);
newEl.price_series_id = checkForNull(el.price_series_id);
newEl.last_price_date = checkForNull(el.last_price_date);
newEl.last_avg_price = checkForNull(el.last_avg_price);
newEl.currency = checkForNull(el.currency);
newEl.measure_unit = checkForNull(el.measure_unit);
commodityDetailsLinks = [];
commodityDetailsRefObj = {};
commodityDetailsRefObj.rel = "commodity_details";
commodityDetailsRefObj.href = "http://5.249.148.180:8280/commodity_details/" + checkForNull(el.commodity_details_id);
commodityDetailsRefObj.type = "GET";
commodityDetailsLinks.push(commodityDetailsRefObj);
newEl.links = commodityDetailsLinks;
commodity.push(newEl);
}
response.commodities.commoditiesList = commodity;
}
log.info("PROCESSED RESPONSE:");
//var jsonStr = JSON.stringify(response, null, 2); // spacing level = 2
//log.info(jsonStr);
selfLinks = [];
selfsRefObj = {};
selfsRefObj.rel = "self";
selfsRefObj.href = "http://5.249.148.180:8280/market/" + checkForNull(response.id);
selfsRefObj.type = "GET";
selfLinks.push(selfsRefObj);
response.links = selfLinks;
delete response.id;
var jsonStr = JSON.stringify(response, null, 2); // spacing level = 2
log.info("RESPONSE PROCESSED:");
log.info(jsonStr);
// put payload back
mc.setPayloadJSON(response);
log.info("This is the end");]]></script>
<property name="RESPONSE" scope="default" type="STRING" value="true"/>
<header action="remove" name="To" scope="default"/>
<send/>
</inSequence>
<outSequence>
<send/>
</outSequence>
<faultSequence/>
</resource>
</api>在JavaScript中，中介发生了一些非常奇怪的事情。
像API管理器一样调用我的API，试试它工具(重要:问题似乎是--标题"Accept: application/json"报头)：
curl -X GET --header "Accept: application/json" --header "Authorization: Bearer c86b19dac9dfd7406ebe9013373c9de9" "https://api.MY-COMPANY.org/api/dsa2/v1.0.0/market/12?lang=1"我将这个错误的JSON作为有效负载值(我的pl_string的值)获得：
{
"Markets": {
"Market": [{
"market_id": 12,
"market_name": "Kouthiaba",
"market_description": "Kouthiaba Market",
"localization_id": "2",
"long": null,
"lat": null,
"country": "Senegal",
"regione": null,
"province": null,
"city": null,
"district": null,
"town": null,
"village": null,
"commodities": {
"commoditiesList": [{
"commodity_details_id": 43,
"commodity_name_en": "Millet",
"commodity_name": "Millet",
"description": "Millet",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fmillet.png?alt=media&token=ff9c67ab-e07a-4097-95ae-826fe1aa49ed",
"market_commodity_details_id": 178,
"price_series_id": 2494,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": "150.0000",
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 13,
"commodity_name_en": "Sorghum",
"commodity_name": "Sorghum",
"description": "Sorghum",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fsorghum.png?alt=media&token=ae33f8e8-50c4-4b8e-868f-1997d50d7ad4",
"market_commodity_details_id": 179,
"price_series_id": 2495,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": "160.0000",
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 11,
"commodity_name_en": "Maize",
"commodity_name": "Maize",
"description": "Maize is a staple food in many parts of the world, with a total production of 1040M tonnes. However, not all of the maize produced is for human consumption but it is also utilised in bio fuel production. Some of the maize produced is used for corn ethanol, animal feed and other maize products such as corn-starch and corn syrup. Maize for human consumption is used in five different forms 1) Popcorn 2) Flint corn 3) Dent corn 4) Floury corn and 5) Sweet corn.",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fmaize.png?alt=media&token=34d5a149-1721-47e9-863b-c939c7fd7419",
"market_commodity_details_id": 180,
"price_series_id": 2496,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": "125.0000",
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 38,
"commodity_name_en": "Rice Ordinary",
"commodity_name": "Rice Ordinary",
"description": "Rice Ordinary",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Friz.png?alt=media&token=c35e7648-1793-423b-acd2-52d8a1e58c53",
"market_commodity_details_id": 181,
"price_series_id": 2497,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": "285.0000",
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 39,
"commodity_name_en": "Rice Perfumed",
"commodity_name": "Rice Perfumed",
"description": "Rice Perfumed",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Friz.png?alt=media&token=c35e7648-1793-423b-acd2-52d8a1e58c53",
"market_commodity_details_id": 182,
"price_series_id": 2498,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": "450.0000",
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 40,
"commodity_name_en": "Black Eyed Pea",
"commodity_name": "Black Eyed Pea",
"description": "Black Eyed Pea",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fblack_eyed_pea.png?alt=media&token=ab397785-68da-413a-978b-e0ebab8407b4",
"market_commodity_details_id": 183,
"price_series_id": 2499,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": "325.0000",
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 42,
"commodity_name_en": "Peanut with Shell",
"commodity_name": "Peanut with Shell",
"description": "Peanut with Shell",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fpeanut.png?alt=media&token=6d5ded68-3126-44df-b429-89fe32483d2d",
"market_commodity_details_id": 184,
"price_series_id": 2500,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": "175.0000",
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 41,
"commodity_name_en": "Peanut without Shell",
"commodity_name": "Peanut without Shell",
"description": "Peanut without Shell",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fpeanut_open.png?alt=media&token=d5af0a5c-6327-418e-9fac-19d34fcedaf5",
"market_commodity_details_id": 185,
"price_series_id": 2501,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": "325.0000",
"currency": "XOF",
"measure_unit": "kilogram"
}
]
}
}
]
}
}这个JSON破坏了我的脚本，因为我有：
{
"Markets": {
"Market": [
..................
]
}
}相反(如预期)：
{“市场”：{“市场”：}}
奇怪的是，如果我对API管理器执行相同的调用(在我的shell中使用cURL )，而不设置- header "Accept: application/json"报头，采用这种方式：
curl -X GET -头“授权:无记名c86b19dac9dfd7406ebe9013373c9de9”"https://api.MY-COMPANY.org/api/dsa/v1.0.0/market/12?lang=1“
我正在获得正确的JSON，并且我的脚本没有中断，实际上，我的JSON有效负载(我的pl_string的值)现在是：
{
"Markets": {
"Market": {
"market_id": 12,
"market_name": "Kouthiaba",
"market_description": "Kouthiaba Market",
"localization_id": 2,
"long": {
"@nil": "true"
},
"lat": {
"@nil": "true"
},
"country": "Senegal",
"regione": {
"@nil": "true"
},
"province": {
"@nil": "true"
},
"city": {
"@nil": "true"
},
"district": {
"@nil": "true"
},
"town": {
"@nil": "true"
},
"village": {
"@nil": "true"
},
"commodities": {
"commoditiesList": [{
"commodity_details_id": 43,
"commodity_name_en": "Millet",
"commodity_name": "Millet",
"description": "Millet",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fmillet.png?alt=media&token=ff9c67ab-e07a-4097-95ae-826fe1aa49ed",
"market_commodity_details_id": 178,
"price_series_id": 2494,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": 150.0000,
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 13,
"commodity_name_en": "Sorghum",
"commodity_name": "Sorghum",
"description": "Sorghum",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fsorghum.png?alt=media&token=ae33f8e8-50c4-4b8e-868f-1997d50d7ad4",
"market_commodity_details_id": 179,
"price_series_id": 2495,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": 160.0000,
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 11,
"commodity_name_en": "Maize",
"commodity_name": "Maize",
"description": "Maize is a staple food in many parts of the world, with a total production of 1040M tonnes. However, not all of the maize produced is for human consumption but it is also utilised in bio fuel production. Some of the maize produced is used for corn ethanol, animal feed and other maize products such as corn-starch and corn syrup. Maize for human consumption is used in five different forms 1) Popcorn 2) Flint corn 3) Dent corn 4) Floury corn and 5) Sweet corn.",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fmaize.png?alt=media&token=34d5a149-1721-47e9-863b-c939c7fd7419",
"market_commodity_details_id": 180,
"price_series_id": 2496,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": 125.0000,
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 38,
"commodity_name_en": "Rice Ordinary",
"commodity_name": "Rice Ordinary",
"description": "Rice Ordinary",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Friz.png?alt=media&token=c35e7648-1793-423b-acd2-52d8a1e58c53",
"market_commodity_details_id": 181,
"price_series_id": 2497,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": 285.0000,
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 39,
"commodity_name_en": "Rice Perfumed",
"commodity_name": "Rice Perfumed",
"description": "Rice Perfumed",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Friz.png?alt=media&token=c35e7648-1793-423b-acd2-52d8a1e58c53",
"market_commodity_details_id": 182,
"price_series_id": 2498,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": 450.0000,
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 40,
"commodity_name_en": "Black Eyed Pea",
"commodity_name": "Black Eyed Pea",
"description": "Black Eyed Pea",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fblack_eyed_pea.png?alt=media&token=ab397785-68da-413a-978b-e0ebab8407b4",
"market_commodity_details_id": 183,
"price_series_id": 2499,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": 325.0000,
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 42,
"commodity_name_en": "Peanut with Shell",
"commodity_name": "Peanut with Shell",
"description": "Peanut with Shell",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fpeanut.png?alt=media&token=6d5ded68-3126-44df-b429-89fe32483d2d",
"market_commodity_details_id": 184,
"price_series_id": 2500,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": 175.0000,
"currency": "XOF",
"measure_unit": "kilogram"
}, {
"commodity_details_id": 41,
"commodity_name_en": "Peanut without Shell",
"commodity_name": "Peanut without Shell",
"description": "Peanut without Shell",
"image_link": "https://firebasestorage.googleapis.com/v0/b/my-company-digital-services-portfolio.appspot.com/o/img%2Ficons%2Fagrimarket%2Fcommodity%2Fpeanut_open.png?alt=media&token=d5af0a5c-6327-418e-9fac-19d34fcedaf5",
"market_commodity_details_id": 185,
"price_series_id": 2501,
"last_price_date": "2018-03-18+01:00",
"last_avg_price": 325.0000,
"currency": "XOF",
"measure_unit": "kilogram"
}
]
}
}
}
}这并没有破坏我的剧本。
所以，我的问题是：
1)为什么将此头设置为我的调用--我的JSON (由以格式转换的DSS查询调用的结果获得)是不同的？
2)我可以说tO WSO2 API管理器以避免在调用中设置这个*-标头"Accept: application/json"**头吗？实际上，最好的做法是让我的API管理器执行如下调用：
curl -X GET --header "Authorization: Bearer c86b19dac9dfd7406ebe9013373c9de9" "https://api.MY-COMPANY.org/api/dsa/v1.0.0/market/12?lang=1"3)目前，我的API管理器正在执行此调用：
curl -X GET --header "Accept: application/json" --header "Authorization: Bearer c86b19dac9dfd7406ebe9013373c9de9" "https://api.MY-COMPANY.org/api/dsa/v1.0.0/market/12?lang=1"我认为这个--报头"Accept: application/json"标头被传播到对API的ESB实现的调用(如果我做了错误的断言，请更正我)。
万一我能在API流开始时将这个头移到我的API定义中呢？可能是个主意？
回答 1
Stack Overflow用户
发布于 2018-04-18 07:44:18
问题似乎是--标题"Accept: application/json“标题。
我假设您正在从APIs中尝试API，其中json响应类型是默认的。可以在API定义中更改默认值(或设置受支持值列表)，以填充每个资源的响应类型
1)为什么将这个头设置为我的调用--我的JSON (它是由以JSON格式转换的DSS查询调用的结果获得的)是不同的？
我相信DSS使用不同的库(或库版本)将XML转换为JSON。根据我的经验，如果可能，尽量避免这种转换(因为XML不显式地包含值类型信息)
您甚至可以在axis2的某个地方禁用此自动转换。xml (用于API、DSS和ESB)
2)我可以说tO WSO2 API管理器以避免在调用中设置这个*-标头"Accept: application/json"**头吗？实际上最好的做法是我的API管理器
如前所述，您可以在发布服务器中设置默认值或受支持的值。只有are才使用设置响应类型，客户端可以发送任何内容。
3)目前，我的API管理器正在执行此调用：.-标头"Accept: application/json“报头被传播到对我的API的ESB实现的调用(如果我做了错误的断言，请更正我)。
所有标头(授权除外)都被传播
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/49880692
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