I am using Angular + Core v7.0.0, and trying to supply an API. I need this API to read the Http Request Body. I tested it with a simple endpoint, but always get error.
Here is the test endpoint method:
public class TestAppService : AppServiceBase { public string ReceiveString([FromBody] string body) { return body; } }
I tested it on swager. Whatever the input string is, it always returns an 400 error:
{ "result": null, "targetUrl": null, "success": false, "error": { "code": 0, "message": "Your request is not valid!", "details": "The following errors were detected during validation.\r\n - Unexpected character encountered while parsing value: x. Path '', line 1, position 1.\r\n", "validationErrors": [ { "message": "Unexpected character encountered while parsing value: x. Path '', line 1, position 1.", "members": [ "" ] } ] }, "unAuthorizedRequest": false, "__abp": true }
What did I miss?
Thanks,
6 Answer(s)
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hi
Try changing the parameters of the
ReceiveStringmethod from sting to class (dto).Such as
ReceiveStringInput, then the front end uses http body to pass json to the api. -
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Yes, if I can define the class, I don't need to use [FromBody]. This API acts as a "web hook". I cannot control what data type is in the request body from client. It may be a json object, or a xml document, or just a plan string. I've tried to replace string type with object type on input prameter. Such as :
public class TestAppService : AppServiceBase { public object ReceiveData([FromBody] object body) { return body; } }
It works only if client request body with json object. It still returns same error, if the request body is other types (e.g. string or xml).
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This API acts as a "web hook".
Can you share the http information for this web hook request?
Example
POST /test HTTP/1.1 Host: localhost:4567 Content-Type: application/json Content-Length: 6615 { "action": "opened", "issue": { "url": "https://api.github.com/repos/octocat/Hello-World/issues/1347", "number": 1347, ... } } -
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I am not too sure the request http information such as Content-Type, because I connot control the client side.
As I know so far, the request Content-Type can be: application/x-www-form-urlencoded, application/x-www-urlencoded, text/xml, application/xml, text/plain.
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In order not to affect the application's model binding, the easiest way is to write a controller method. Manually read Request.Body in the method, the method does not require any parameters.
example: https://weblog.west-wind.com/posts/2017/sep/14/accepting-raw-request-body-content-in-aspnet-core-api-controllers#Reading-Request.Body-for-Raw-Data
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Good article!
Thanks!
