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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(70.4, 95%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EFS%3C/text%3E%3C/svg%3E)
The request has an invalid header name when I access the Azure API management demo
http status :400
What is the reason
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 10%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMM%3C/text%3E%3C/svg%3E)
Fan Shi Can you elaborate more on the issue with additional details such as request ID, full headers, timestamp, and if possible, include the full error message. you mentioned about APIM demo, is there any doc/tutorial reference you talk about?
MuthuKumaranMurugaachari-MSFT Thank you for your response. I have found the answer to this question because the Azure API default policy has multiple duplicate header checks
Fan Shi thanks for sharing it and glad to hear that you resolved the issue.
The reason is that the default policy of Azure API has multiple duplicate header checks