Reasons and solutions for 400 errors reported in Java projects

Introduction to 400 errors in java projects: (Recommended: java video tutorial)

400 Bad Request:

Requesting syntax error. Reason-Phrase should flag this detailed syntax error, such as "Missing Call-ID header field".

HTTP 400 Error - Invalid Request (Bad Request)

Sometimes HTTP 400 Error - Invalid Request (Bad Request) will be reported when ajax requests background data; if this invalid request error occurs, it means that the request does not exist Enter the background service;

Reason:

1) The field name or field type of the data submitted by the front end is inconsistent with the entity class of the background, or the parameters submitted by the front end are inconsistent with the number of parameters required by the background. Inconsistent, resulting in inability to encapsulate;

2) The data submitted by the front end to the backend should be of json string type, but the front end did not convert the object into a string type;

Solution:

1) Compare the field names and type to ensure consistency

2) Use stringify to convert the object passed by the front end into string data: JSON.stringify(param) ;

More For java knowledge, please pay attention to the java basic tutorial column.

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