Azure API Management policy expressions. Policy expressions syntax is C 6. Each expression has access to the implicitly provided context variable and an allowed subset of. NET Framework types. Tip For more information about policy expressions, see the Policy Expressions video. For demonstrations of configuring policies using policy expressions, see Cloud Cover Episode 1. More API Management Features with Vlad Vinogradsky. This video contains the following policy expression demonstrations. This article explains how to use Token Based Authentication using ASP. NET Web API, OWIN and Identity with Entity Framework. Although it looks simple on the surface, adding async support to Json. NET was a huge task. Special thanks to Jon Hanna for contributing most of this work. Json. NET NuGetJson. NETNuGetNewtonsoft. Json. Utf8JsonCJSON. NET Standard 2. 0. NETXamarin. See how to apply policy at the API level to supply context information to the backend service using the Set query string parameter and Set HTTP header policies. At 1. 2 1. 0 there is a demo of calling an operation in the developer portal where you can see these policies at work. See how to use the Validate JWT policy to pre authorize access to operations based on token claims. Fast forward to 1. See how to use an API Inspector trace to see how policies are evaluated and the results of the evaluations. See how to use policy expressions with the Get from cache and Store to cache policies to configure API Management response caching duration that matches the response caching of the backend service as specified by the backed services Cache Control directive. Learn about policy expressions in Azure API Management. CLR type Supported methods Newtonsoft. Json. Linq. Extensions All methods are supported. Setting ret. DateTimeZoneHandling Newtonsoft. Json. DateTimeZoneHandling. Utc doesnt work as expected because ret created by the base Breeze. WebApi. BreezeConfig. CLR CLR type Supported methods Newtonsoft. Json. Linq. Extensions Newtonsoft. Json. Linq. Extensions All. Newtonsoft Json Datetimeoffset' title='Newtonsoft Json Datetimeoffset' />See how to perform content filtering by removing data elements from the response received from the backend service using the Control flow and Set body policies. Start at 3. 1 5. The Dark Sky Forecast API used for this demo. To download the policy statements used in this video, see the api management samplespolicies github repo. Syntax Single statement expressions are enclosed in expression, where expression is a well formed C expression statement. Multi statement expressions are enclosed in expression. All code paths within multi statement expressions must end with a return statement. Examplestrue. 11. To. String. Hi There. Length. Regex. Matchcontext. Response. Headers. Get. Value. Or. DefaultCache Control, max agelt max. Age d. Groupsmax. Age Value. context. Variables. Contains. Keymax. Age Parsestringcontext. Variablesmax. Age 3. Request. Headers. Try. Get. ValueAuthorization, out value. Encoding. UTF8. Get. StringConvert. From. Base. 64. Stringvalue. Usage Expressions can be used as attribute values or text values in any of the API Management policies, unless the policy reference specifies otherwise. Important Note that when you use policy expressions, there is only limited verification of the policy expressions when the policy is defined. Since the expressions are executed at run time in the inbound or outbound pipeline by the gateway, any run time exceptions generated by the policy expressions will result in a runtime error in the API call. NET Framework types allowed in policy expressions The following table lists the. NET Framework types and their members that are allowed in policy expressions. CLR type. Supported methods. Newtonsoft. Json. Linq. Extensions. All methods are supported. Newtonsoft. Json. Linq. JArray. All methods are supported. Newtonsoft. Json. Linq. JConstructor. All methods are supported. Newtonsoft. Json. Linq. JContainer. All methods are supported. Newtonsoft. Json. Linq. JObject. All methods are supported. Newtonsoft. Json. Linq. JProperty. All methods are supported. Newtonsoft. Json. Linq. JRaw. All methods are supported. Newtonsoft. Json. Linq. JToken. All methods are supported. Newtonsoft. Json. Linq. JToken. Type. All methods are supported. Newtonsoft. Json. Linq. JValue. All methods are supported. System. Collections. Generic. IRead. Only. Collectionlt T All. System. Collections. Generic. IRead. Only. Dictionarylt TKey, TValue All. System. Collections. Generic. ISetlt TKey, TValue All. System. Collections. Generic. Key. Value. Pairlt TKey, TValue Key, Value. System. Collections. Generic. Listlt TKey, TValue All. System. Collections. Generic. Queuelt TKey, TValue All. System. Collections. Generic. Stacklt TKey, TValue All. System. Convert. All. System. Date. Time. All. System. Date. Time. Kind. Utc. System. Date. Time. Offset. All. System. Decimal. All. System. Double. All. System. Guid. All. System. IEnumerablelt T All. System. IEnumeratorlt T All. System. Int. 16. All. System. Int. 32. All. System. Int. 64. All. System. Linq. Enumerablelt T All methods are supported. System. Math. All. System. Midpoint. Rounding. All. System. Nullablelt T All. System. Random. All. System. SByte. All. System. Security. Cryptography. HMACSHA3. All. System. Security. Cryptography. HMACSHA5. All. System. Security. Cryptography. Hash. Algorithm. All. System. Security. Cryptography. HMACAll. System. Security. Cryptography. HMACMD5. All. System. Security. Cryptography. HMACSHA1. All. System. Security. Cryptography. HMACSHA2. All. System. Security. Cryptography. Keyed. Hash. Algorithm. All. System. Security. Cryptography. MD5. All. System. Security. Cryptography. RNGCrypto. Service. Provider. All. System. Security. Cryptography. SHA1. All. System. Security. Cryptography. SHA1. Managed. All. System. Security. Cryptography. SHA2. 56. All. System. Security. Cryptography. SHA2. 56. Managed. All. System. Security. Cryptography. SHA3. All. System. Security. Cryptography. SHA3. Maisie Rain And Kayla Green. Managed. All. System. Security. Cryptography. SHA5. 12. All. System. Security. Cryptography. SHA5. 12. Managed. All. System. Single. All. System. String. All. System. String. Split. Options. All. System. Text. Encoding. All. System. Text. Regular. Expressions. Capture. Index, Length, Value. System. Text. Regular. Expressions. Capture. Collection. Count, Item. System. Text. Regular. Expressions. Group. Captures, Success. System. Text. Regular. Expressions. Group. Collection. Count, Item. System. Text. Regular. Expressions. Match. Empty, Groups, Result. System. Text. Regular. Expressions. Regex. Is. Match, Match, Matches, Replace. System. Text. Regular. Expressions. Regex. Options. Compiled, Ignore. Case, Ignore. Pattern. Whitespace, Multiline, None, Right. To. Left, Singleline. System. Time. Span. Revit Furniture Family S. All. System. Tuple. All. System. UInt. All. System. UInt. All. System. UInt. All. System. Uri. All. System. Xml. Linq. Extensions. All methods are supported. System. Xml. Linq. XAttribute. All methods are supported. System. Xml. Linq. XCData. All methods are supported. System. Xml. Linq. XComment. All methods are supported. System. Xml. Linq. XContainer. All methods are supported. System. Xml. Linq. XDeclaration. All methods are supported. System. Xml. Linq. XDocument. All methods are supported. System. Xml. Linq. XDocument. Type. All methods are supported. System. Xml. Linq. XElement. All methods are supported. System. Xml. Linq. XName. All methods are supported. System. Xml. Linq. XNamespace. All methods are supported. System. Xml. Linq. XNode. All methods are supported. System. Xml. Linq. XNode. Document. Order. Comparer. All methods are supported. System. Xml. Linq. XNode. Equality. Comparer. All methods are supported. System. Xml. Linq. XObject. All methods are supported. System. Xml. Linq. XProcessing. Instruction. All methods are supported. System. Xml. Linq. XText. All methods are supported. System. Xml. Xml. Node. Type. All Context variable A variable named context is implicitly available in every policy expression. Its members provide information pertinent to the request. All of the context members are read only. Context Variable. Allowed methods, properties, and parameter valuescontext. Api IApi. Deployment. Last. Error. Operation. Product. Request. Request. Id Guid. Response. Subscription.