当我尝试在我的角度应用程序中上传base64图像时,http.post方法会引发错误:
Failed to execute 'setRequestHeader' on 'XMLHttpRequest': Value is not a valid ByteString.
这是代码的样子:
let headers = new Headers();
headers.append("Accept", 'application/json');
headers.append("Content-Type", "application/json");
headers.append('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; …) Gecko/20100101 Firefox/68.0' );
let postData = {
"AudometerCapture":this.abc,
"Door1":this.abc,
"Door2":this.abc,
"Door3":this.abc,
"Door4":this.abc,
"TransactionID": 90
}
this.http.post('http://apiearningwheels.sharpnettechnology.com/api/DailyImageUpload/UploadDailyImages', JSON.stringify(postData), {headers: headers})
.map(res => res.json())
.subscribe(data => {
console.log(data);
this.showLongToast("result is :- " + res);
});
我希望输出为'result is = '
,但出现错误。
使用Postman,请求可以正常工作。
答案 0 :(得分:1)
抛出该错误是因为最后一个标头中有三个点(...)的符号,这些符号不能正确转换为ByteString。
因此,您必须删除行或进行如下更改:
headers.append('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; …) Gecko/20100101 Firefox/68.0' );
到
headers.append('User-Agent', 'Mozilla/5.0 (Windows NT 10.0;) Gecko/20100101 Firefox/68.0' );
我使用https://codesandbox.io/s/angular测试了标头,这使我在该行上犯了一个错误:Cannot convert string to ByteString because the character at index 30 has value 8230 which is greater than 255.